ACS Energy Letters Pub Date : 2026-10-09Epub Date: 2026-09-02DOI: 10.1021/acsenergylett.6c01923
Leo Romanetz, M. Alejandra Hermosilla-Palacios, Debjit Ghoshal, Obadiah G. Reid, Jeffrey L. Blackburn
{"title":"Triplet or Charge-Separated State? Distinguishing Long-Lived, Photogenerated Electronic States in SWCNT/MoS2 Heterojunctions","authors":"Leo Romanetz, M. Alejandra Hermosilla-Palacios, Debjit Ghoshal, Obadiah G. Reid, Jeffrey L. Blackburn","doi":"10.1021/acsenergylett.6c01923","DOIUrl":"10.1021/acsenergylett.6c01923","url":null,"abstract":"<p>Single-walled carbon nanotubes (SWCNTs) and their interfaces with an array of materials are promising platforms for next-generation energy-harvesting and conversion devices. Yet the challenge of identifying the excited-state optical spectra of electronic states is a barrier to evaluating their potential for those applications. Here, we use photoinduced absorption-detected magnetic resonance (PADMR) spectroscopy to provide unambiguous assignments in the near-infrared (NIR) photoinduced absorption spectrum of (6,5) SWCNT/MoS<sub>2</sub> heterojunctions. Driving the distinguishable magnetic resonance transitions of weakly magnetic dipole-coupled charge separated states versus SWCNT-localized triplets shows that the NIR-induced absorption peak that is bathochromically shifted from the first exciton bleach corresponds solely to separated charges. Triplet excited-state absorption is assigned at higher energy. Signatures for the interfacial charge-separated state and triplet states are stronger in the bilayer than in the neat nanotubes, revealing a charge recombination mechanism across the SWCNT/MoS<sub>2</sub> interface that forms spin-polarized triplet states on the SWCNTs.</p>","PeriodicalId":16,"journal":{"name":"ACS Energy Letters ","volume":"11 10","pages":"6680–6689"},"PeriodicalIF":17.5,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148885312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Intelligent Response and Dynamic Stress Equilibrium Structure Endow Lithium-Rich Oxide Cathodes with Long Cycle Life","authors":"Yufa Zhou, Shengnan He, Rui Zhang, Shaowu Lai, Yaxin Pu, Chenchen Li, Xu Xue, Chao Zheng, Zhijun Wu, Jiantuo Gan, Wubin Du, Yanxia Liu, Mingchang Zhang, Yaxiong Yang, Hongge Pan","doi":"10.1021/acsenergylett.6c02095","DOIUrl":"10.1021/acsenergylett.6c02095","url":null,"abstract":"<p>Lithium-rich oxides (LROs) deliver an energy density of over 1000 Wh kg<sup>−1</sup> for lithium-ion battery cathode applications, yet cycling-induced stress accumulation triggers structural degradation and poor cyclic stability. Herein, hierarchical twin structures are prefabricated in LROs. Prestress at twin boundaries forms interlaced stress networks to adaptively accommodate tensile/compressive strains upon cycling and dissipate localized stress concentration. The self-adaptive twin structure tolerates cyclic volume fluctuation, preserving the layered framework against irreversible spinel/rock-salt phase transition during long-term structural relaxation. The twin-modified LRO retains 94.98% capacity after 500 cycles (1 C) and 80.79% after 800 cycles, with 155.31 mAh g<sup>−1</sup> at 5 C. The pouch cell delivers 12.59 Ah discharge capacity and maintains 84.83% capacity after 49 cycles. This work offers a strategy to tune electrochemo-mechanical properties for designing cathode materials.</p>","PeriodicalId":16,"journal":{"name":"ACS Energy Letters ","volume":"11 10","pages":"6764–6775"},"PeriodicalIF":17.5,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148885313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Unraveling Thermal Accumulation in Perovskite/Silicon Tandems: Structure- and Material-Driven Heating in SHJ, TOPCon, and TBC Bottom Cells","authors":"Kaiyue Li, Xuan Chang, Xueliang Yang, Yanfeng Li, Jinchao Shi, Mengmeng Wu, Bo Yu, Huan Yang, Haishun Gao, Yuke Ren, Guoang Li, Shuaihang Hou, Hang Weng, Bingbing Chen, Dehua Yang, Shufang Wang, Jianhui Chen","doi":"10.1021/acsenergylett.6c01614","DOIUrl":"10.1021/acsenergylett.6c01614","url":null,"abstract":"<p>Perovskite/silicon (PVK/Si) tandem solar cells approach 35% efficiency, while near-infrared (NIR)-induced thermal accumulation severely restricts their operational stability. This work reveals structural and material heating origins of three mainstream silicon bottom sub-cells: SHJ, TOPCon, and TBC. Under NIR irradiation, the SHJ bottom cell shows the highest steady-state temperature (65.2 °C) and maximum efficiency loss (7.91% at 150 °C) due to its rear texture extending the NIR optical path and low-thermal-conductivity ITO/a-Si:H layers. In contrast, the TBC bottom sub-cell with a planar rear surface and high-thermal-conductivity Si<sub>x</sub>N<sub>y</sub>/poly-Si stack presents the weakest heat buildup and best stability with only 5.86% <em>PCE</em> decay. IEC-standard long-term thermal aging tests confirm the serious performance degradation of SHJ bottom sub-cell. COMSOL simulations validate our findings in both 2T and 4T tandem configurations. This work offers useful references for thermally driven bottom-cell selection among the studied architectures, toward efficient, stable, and industrially viable PVK/Si tandem solar cells.</p>","PeriodicalId":16,"journal":{"name":"ACS Energy Letters ","volume":"11 10","pages":"6525–6536"},"PeriodicalIF":17.5,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148973159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ACS Energy Letters Pub Date : 2026-10-09Epub Date: 2026-09-16DOI: 10.1021/acsenergylett.6c02600
Braulio Reyes-Suárez, Zhifang Du, Neethu Thomas, Zhong-Ze Qu, Tomasz Pawlak, Rushil Vasant, Doan Vu, Sangcheol Yoon, Sam Mugiraneza, Yunyan Lai, Jordan Fishburn, Sangmin Chae, Ahra Yi, Parth Raval, Subhrangsu Mukherjee, Yunpeng Qin, Steven Xiao, Hyo Jung Kim, Harald Ade, Thuc-Quyen Nguyen, G. N. Manjunatha Reddy
{"title":"Correction to “Solvent-Induced Polymorphism Influences Efficiency in Organic Solar Cells”","authors":"Braulio Reyes-Suárez, Zhifang Du, Neethu Thomas, Zhong-Ze Qu, Tomasz Pawlak, Rushil Vasant, Doan Vu, Sangcheol Yoon, Sam Mugiraneza, Yunyan Lai, Jordan Fishburn, Sangmin Chae, Ahra Yi, Parth Raval, Subhrangsu Mukherjee, Yunpeng Qin, Steven Xiao, Hyo Jung Kim, Harald Ade, Thuc-Quyen Nguyen, G. N. Manjunatha Reddy","doi":"10.1021/acsenergylett.6c02600","DOIUrl":"10.1021/acsenergylett.6c02600","url":null,"abstract":"","PeriodicalId":16,"journal":{"name":"ACS Energy Letters ","volume":"11 10","pages":"7006–7006"},"PeriodicalIF":17.5,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148973830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ACS Energy Letters Pub Date : 2026-10-09Epub Date: 2026-09-16DOI: 10.1021/acsenergylett.6c02445
Boyu Guo, Gabriel R. McAndrews, Samantha C. Kaczaral, Matteo R. S. Poma, Ryan A. DeCrescent, Jiazhen Li, Qing Gu, Michael D. McGehee, Aram Amassian
{"title":"A Composition-Dependent Stress–Diffusion Framework Identifies Humidity-Tolerant Processing Windows in Hybrid Perovskite Solar Cells","authors":"Boyu Guo, Gabriel R. McAndrews, Samantha C. Kaczaral, Matteo R. S. Poma, Ryan A. DeCrescent, Jiazhen Li, Qing Gu, Michael D. McGehee, Aram Amassian","doi":"10.1021/acsenergylett.6c02445","DOIUrl":"10.1021/acsenergylett.6c02445","url":null,"abstract":"<p>Hybrid perovskite composition controls ion transport and environmental tolerance, but its role in residual-stress relaxation and implications for ambient fabrication remain unclear. We establish a composition-dependent stress–diffusion framework linking cation/halide chemistry, grain-boundary halide transport, and moisture uptake. In situ curvature and grazing-incidence X-ray diffraction measurements show that tensile stress relaxes by diffusion-mediated inelastic deformation across single- and mixed-composition perovskites. Temperature-dependent relaxation yields activation energies consistent with vacancy-mediated grain-boundary diffusion in methylammonium-based films and lower-barrier grain-boundary and triple-junction transport in formamidinium-based films. Humidity accelerates relaxation through mobile moisture adsorbed near grain boundaries and trapped moisture incorporated into the lattice. Stress pre-relaxation reduces moisture uptake by up to an order of magnitude, extending ambient storage stability within a universal processing window. In devices, moderate humidity up to 50% relative humidity passivates shallow traps and improves average performance without compromising 300-h operational stability, establishing a stress–diffusion framework for ambient perovskite device manufacturing.</p>","PeriodicalId":16,"journal":{"name":"ACS Energy Letters ","volume":"11 10","pages":"6959–6971"},"PeriodicalIF":17.5,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148973962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Passivation-Induced Interfacial Fields Reshape Carrier-Extraction Landscapes in Perovskite Solar Cells","authors":"Peng Xu, Jing Leng, Linghui Zhang, Qingshun Dong, Tianle Fan, Shengye Jin, Wenming Tian","doi":"10.1021/acsenergylett.6c02149","DOIUrl":"10.1021/acsenergylett.6c02149","url":null,"abstract":"<p>Organic ammonium passivation is known to improve perovskite solar cells (PSCs) by modifying interfacial defects, energetics, and electrostatics, yet how these local interfacial changes manifest as spatial carrier-extraction pathways inside operating devices remains unclear. Here, we combine back-excitation transient reflection spectroscopy, cross-sectional photocurrent imaging, and drift–diffusion modeling to directly correlate interfacial modification with longitudinal carrier transport and spatial carrier extraction. Although phenethylammonium iodide (PEAI) and octylammonium iodide (OAI) are introduced at the hole-transport interface, both produce direction-dependent carrier transport across the absorber and enhance photocurrent generation near the remote electron-transport-layer interface. Drift–diffusion analysis shows that passivation shifts the intersection point of the electron and hole collection-probability curves toward the electron-transport layer (ETL), with OAI producing a more spatially extended interfacial field than PEAI. Our findings show that molecular passivation redistributes carrier-collection probabilities across the absorber, thereby enhancing extraction near the remote interface.</p>","PeriodicalId":16,"journal":{"name":"ACS Energy Letters ","volume":"11 10","pages":"6841–6848"},"PeriodicalIF":17.5,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149049810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ACS Energy Letters Pub Date : 2026-10-09Epub Date: 2026-09-28DOI: 10.1021/acsenergylett.6c02326
Yang-Kook Sun, Greco González Miera
{"title":"A Decade in the Evolving Landscape of Energy Research (Part II): Storage Batteries","authors":"Yang-Kook Sun, Greco González Miera","doi":"10.1021/acsenergylett.6c02326","DOIUrl":"10.1021/acsenergylett.6c02326","url":null,"abstract":"","PeriodicalId":16,"journal":{"name":"ACS Energy Letters ","volume":"11 10","pages":"6421–6424"},"PeriodicalIF":17.5,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149091010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Designing Pitch-Derived Spherical Hard Carbon via Catalytic Aerobic Oxidation and Closed-Pore Regulation","authors":"Shuhui Li, Weihuang Wang, Rui Liu, Zheng Wang, Chenglu Huang, Hongliang Li, Xinxin Cao, Jiang Zhou, Liangbing Wang, Jie Zeng","doi":"10.1021/acsenergylett.6c01910","DOIUrl":"10.1021/acsenergylett.6c01910","url":null,"abstract":"<p>Pitch-derived hard carbon emerges as an anode material for sodium-ion batteries, but its performance still suffers from the trade-offs among plateau capacity, rate capability, and compaction density. Herein, a catalytic aerobic oxidation strategy that enables controllable oxidation of pitch is employed to fabricate spherical hard carbon with tunable pore structures, realizing simultaneous enhancement of these abovementioned metrics. The spherical hard carbon achieves charging of 126.5 mAh g<sup>–1</sup> within about 50 s and sustains sodium storage over continuous 1000 cycles at 9 A g<sup>–1</sup>. Under an increased areal loading, the anode maintains an areal capacity of 1.65 mAh cm<sup>–2</sup>, a volumetric capacity up to 332.6 mAh cm<sup>–3</sup> and endures 100 charge–discharge cycles at a current density of nearly 3 mA cm<sup>–2</sup>. This work provides a strategy to design hard carbon anodes with enhanced volumetric capacity and rate performance for space-constrained energy storage scenarios.</p>","PeriodicalId":16,"journal":{"name":"ACS Energy Letters ","volume":"11 10","pages":"6669–6679"},"PeriodicalIF":17.5,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148973162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ACS Energy Letters Pub Date : 2026-10-09Epub Date: 2026-09-09DOI: 10.1021/acsenergylett.6c02530
Taegyu Kim, Hyunji Kweon, Hoseok Lee, Lahyeon Jang, Bonyoung Ku, Myungeun Choi, Sunghyun Lim, Heejin Choo, Lisa Eom, Junha Kwon, Min-Kyung Cho, Young Hwa Jung, Hun-Gi Jung, Jongsoon Kim
{"title":"Stabilizing High-Voltage Operation in O3-Type Na-Layered Cathodes by Suppressing Distortion-Driven Fe Migration","authors":"Taegyu Kim, Hyunji Kweon, Hoseok Lee, Lahyeon Jang, Bonyoung Ku, Myungeun Choi, Sunghyun Lim, Heejin Choo, Lisa Eom, Junha Kwon, Min-Kyung Cho, Young Hwa Jung, Hun-Gi Jung, Jongsoon Kim","doi":"10.1021/acsenergylett.6c02530","DOIUrl":"10.1021/acsenergylett.6c02530","url":null,"abstract":"<p>Fe-based O3-type Na-layered oxides such as Na[Ni<sub>1/3</sub>Fe<sub>1/3</sub>Mn<sub>1/3</sub>]O<sub>2</sub> are attractive cathodes based on earth-abundant elements, yet their high-voltage operation is limited by voltage decay and capacity fading. Here, we identify a distortion−migration cascade initiated by Fe<sup>3+</sup> oxidation to Fe<sup>4+</sup>. The resulting Jahn−Teller distortion of FeO<sub>6</sub> octahedra destabilizes Fe within the transition-metal (TM) framework. This destabilization promotes Fe migration into the Na layer and drives irreversible layered to rocksalt-like reconstruction. A stepwise strategy that reduces the Fe content, reinforces the TM−O framework, and blocks Fe migration into the Na layer interrupts this cascade. The optimized cathode delivers 177.96 mAh g<sup>−1</sup> with an initial Coulombic efficiency of 94.1% and retains 73.5% capacity after 100 cycles. Experimental and computational analyses reveal continuous structural evolution and suppressed Fe migration. These results establish suppression of distortion-driven Fe migration as a key design principle for stabilizing high-voltage operation in Fe-based Na-layered cathodes.</p>","PeriodicalId":16,"journal":{"name":"ACS Energy Letters ","volume":"11 10","pages":"6972–6980"},"PeriodicalIF":17.5,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148933368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ACS Energy Letters Pub Date : 2026-10-09Epub Date: 2026-09-15DOI: 10.1021/acsenergylett.6c01941
Junxiao He, Bowen Yang, Wenhao Li, Anqi Lv, Shibo Wang, Zijia Li, Weichun Pan, Xianyuan Jiang, Bo Gao, Liu Yang, Kun Gao, Chang Wang, Wei Shi, Fengxian Cao, Li Tan, Xinyao Sun, Gege Yan, Xudong Chen, Zhongliang Yan, Xueying Yang, Yang Bai, Jun Yin, Chenxu He, Xinbo Yang
{"title":"Dipolar-Steric Cage Diammonium Passivation for Perovskite/Tunnel Oxide Passivated Contact Tandem Solar Cells","authors":"Junxiao He, Bowen Yang, Wenhao Li, Anqi Lv, Shibo Wang, Zijia Li, Weichun Pan, Xianyuan Jiang, Bo Gao, Liu Yang, Kun Gao, Chang Wang, Wei Shi, Fengxian Cao, Li Tan, Xinyao Sun, Gege Yan, Xudong Chen, Zhongliang Yan, Xueying Yang, Yang Bai, Jun Yin, Chenxu He, Xinbo Yang","doi":"10.1021/acsenergylett.6c01941","DOIUrl":"10.1021/acsenergylett.6c01941","url":null,"abstract":"<p>Resolving the long-standing trade-off between effective interfacial passivation and efficient charge transport remains a central challenge for perovskite/silicon tandem solar cells, particularly at the perovskite/C<sub>60</sub> interface. Here, inspired by the bio-isostere concept, we introduce a dipolar cage strategy that replaces traditional planar phenyl motifs with a rigid bicyclo[2.2.2]octane (BCO) scaffold. Distinct from conventional passivators relying solely on steric shielding, the BCO framework imparts a substantial intrinsic molecular dipole. This architecture establishes a favorable interfacial electrostatic field, substantially reducing the interfacial energetic mismatch for electron extraction while effectively suppressing nonradiative recombination. Utilizing bicyclo[2.2.2]octane-1,4-diammonium diiodide (BCODAI), monolithic perovskite/tunnel oxide passivated contact (TOPCon) tandem solar cells achieve a certified champion efficiency of 32.54%. Crucially, the devices exhibit outstanding operational stability, retaining over 80% of their initial efficiency after 1100 h of continuous operation. This dipolar-steric cage design provides an effective interfacial engineering principle for high-performance tandem photovoltaics.</p>","PeriodicalId":16,"journal":{"name":"ACS Energy Letters ","volume":"11 10","pages":"6697–6706"},"PeriodicalIF":17.5,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148973619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}