Nano LettersPub Date : 2026-10-14Epub Date: 2026-10-01DOI: 10.1021/acs.nanolett.6c03636
Pengpeng Teng, Haifeng Zhao, Wenbin Wang, Dongqin Yuan, Xingjiao Feng, Yatao Zou, Xiyu Luo, Zhongcheng Yuan, Tiankai Zhang, Lian Duan, Tao Yu, Chunxiong Bao, Weidong Xu, Jie Yang, Sai Bai, Xiaodong Shen
{"title":"Manipulating Crystallization and Deprotonation Reaction through Surface Engineering of ZnO for Bright and Stable Near-Infrared Perovskite LEDs","authors":"Pengpeng Teng, Haifeng Zhao, Wenbin Wang, Dongqin Yuan, Xingjiao Feng, Yatao Zou, Xiyu Luo, Zhongcheng Yuan, Tiankai Zhang, Lian Duan, Tao Yu, Chunxiong Bao, Weidong Xu, Jie Yang, Sai Bai, Xiaodong Shen","doi":"10.1021/acs.nanolett.6c03636","DOIUrl":"10.1021/acs.nanolett.6c03636","url":null,"abstract":"<p>Perovskitelight-emitting diodes (LEDs) have attracted significantattention owing to their rapidly increasing external quantum efficiencies(EQEs). However, achieving bright and operationally stable perovskiteLEDs remains a great challenge. Here, we reveal that the most commonlyused surface modifier of zinc-oxide (ZnO) electron-transport layer,polyethylenimine ethoxylate (PEIE), inhibits the perovskite nucleationby inducing in situ chemical reactions of perovskite precursor components,forming thermally unstable interfacial species and reducing long-termoperational stability of resultant devices. We develop a surface-engineeringstrategy by using an ether-based polymer modifier to regulate perovskitecrystallization kinetics and simultaneously suppress ZnO-induced deprotonationduring long-term device operation. As a result, the optimized near-infrared(NIR) perovskite LEDs exhibit a maximum EQE of 24% and a peak radianceof 539 W sr<sup>–1</sup> m<sup>–2</sup>, along withsignificantly enhanced operational stability. Furthermore, partialsubstitution of FA with Cs confirms the generality of this strategy,yielding bright NIR devices with an operational half-lifetime of 561h at 20 mA cm<sup>–2</sup>.</p>","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"26 40","pages":"13979–13986"},"PeriodicalIF":9.1,"publicationDate":"2026-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149088201","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}
Nano LettersPub Date : 2026-10-14Epub Date: 2026-10-05DOI: 10.1021/acs.nanolett.6c03019
Yuanyuan Qiu, Bin Hua, Zhenping Wang, Fei Hu, Dong Zhang, Yang Lu, Marvin L. Cohen, Alex Zettl, Kecheng Cao, Cong Su, Young Woo Choi, Qingqing Ji
{"title":"Boltzmann Sigmoidal Modulation of Vanadium Doping in Monolayer MoS2 by Potassium Iodide","authors":"Yuanyuan Qiu, Bin Hua, Zhenping Wang, Fei Hu, Dong Zhang, Yang Lu, Marvin L. Cohen, Alex Zettl, Kecheng Cao, Cong Su, Young Woo Choi, Qingqing Ji","doi":"10.1021/acs.nanolett.6c03019","DOIUrl":"10.1021/acs.nanolett.6c03019","url":null,"abstract":"<p>Theatomic thickness of two-dimensional (2D) semiconductorsmakesconventional postgrowth substitutional doping highly challenging.Instead, such atomic substitution can be more effectively achieved <em>in situ</em> through chemical vapor deposition synthesis. However,the mechanistic details governing this growth process have remainedpoorly understood. Using V-doped monolayer MoS<sub>2</sub> as a modelsystem, this work elucidates its growth mechanism and doping tunabilityfacilitated by a potassium iodide (KI) promoter. A Raman spectroscopicprobe, established through correlation with scanning transmissionelectron microscopy, was developed to quantify the V dopant concentrationand distribution uniformity. Systematic growth experiments and detailedcharacterizations revealed that doping saturation levels were significantlybelow the precursor feeding ratio. This saturation phenomenon couldbe modulated by KI dosage following a Boltzmann sigmoid function,indicative of an iodide-activated doping mechanism compatible withthe edge passivation substitution (EPS) model. Our findings advancethe doping theory in low-dimensional systems and provide essentialinsights into achieving controlled heteroatom substitution in 2D semiconductors.</p>","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"26 40","pages":"13836–13842"},"PeriodicalIF":9.1,"publicationDate":"2026-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149092230","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}
Nano LettersPub Date : 2026-10-14Epub Date: 2026-09-30DOI: 10.1021/acs.nanolett.6c03008
Chengyu Zhu, Pahuni Jain, Yi Zhang, Junghyun Koo, Weideng Sun, Yaotian Li, Alexander McLeod, Chris Leighton, Gang Qiu
{"title":"Mechanically Exfoliated Metallic Delafossite PdCoO2 Nanomembranes: Quantum Transport and Electrical Evaluation toward Interconnect Applications","authors":"Chengyu Zhu, Pahuni Jain, Yi Zhang, Junghyun Koo, Weideng Sun, Yaotian Li, Alexander McLeod, Chris Leighton, Gang Qiu","doi":"10.1021/acs.nanolett.6c03008","DOIUrl":"https://doi.org/10.1021/acs.nanolett.6c03008","url":null,"abstract":"<p>Metallic delafossiteoxides have drawn attention fortheir ultralowresistivity and coherent electronic transport. However, mesoscopictransport studies are hindered by the limited access to high-qualitynanoscale devices. Here, we report single-crystalline PdCoO<sub>2</sub> nanomembranes, enabling exploration of quasi-two-dimensional (quasi-2D)transport. Shubnikov-de Haas and angle-dependent <em>h/e</em> magnetoresistance oscillations under different magnetic field directionsare observed at low temperatures, from which the electron effectivemass is extracted. Beyond quantum transport, the electrical performanceof PdCoO<sub>2</sub> toward interconnect applications is evaluated.A nearly thickness-independent room-temperature resistivity is observedfor flakes down to 40 nm thickness. The nanomembranes exhibit a breakdowncurrent density up to 113 MA cm<sup>–2</sup>, with excellentthermal stability and electromigration resistance. These results demonstratethat mechanically exfoliated PdCoO<sub>2</sub> flakes preserve thehigh crystalline and electronic quality of bulk crystals in the quasi-2Dlimit, providing a useful platform for mesoscopic transport studiesand interconnect applications.</p>","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"26 40","pages":"13829–13835"},"PeriodicalIF":9.1,"publicationDate":"2026-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149173962","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":"Layer Dependent Ferroelectricity and Electromechanically Coupled Polarization in Two-Dimensional 1T′-ReS2","authors":"Zhengyue Li, Jinfeng Yang, Yinfei Xie, Yang He, Xiaonan Wang, Bo Zou, Bingxuan Zhu, Zhongqi Ren, Chu Xiao, Yangyang Si, Yuxuan Yang, Kangjin Zhou, Jingkai Qin, Chengyan Xu, Hao Tian, Haijun Wu, Huarui Sun","doi":"10.1021/acs.nanolett.6c02868","DOIUrl":"https://doi.org/10.1021/acs.nanolett.6c02868","url":null,"abstract":"<p>Two-dimensional (2D) van der Waals (vdW) materials withslidingferroelectricity exhibit an enormous potential for next-generationnanodevices. Among these, 1T′-ReS<sub>2</sub> with an ultralowsymmetry stands out as a pivotal candidate. However, the fundamentalscientific mechanism underlying sliding ferroelectricity in 1T′-ReS<sub>2</sub> remains poorly understood due to the complexity of its crystalstructure. By integrating STEM, DFT calculations, and KPFM, this workresolves the correlation between AA/AB stacking and polarization in1T′-ReS<sub>2</sub>. PFM and STEM characterizations furtherreveal that the observed ferroelectric-like PFM signals originatefrom flexoelectric-like wrinkles rather than from intrinsic ferroelectricswitching. Finally, device measurements provide evidence of slidingferroelectricity in even-layer AB-stacked ReS<sub>2</sub> and demonstrateits application potential.</p>","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"26 40","pages":"13794–13801"},"PeriodicalIF":9.1,"publicationDate":"2026-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149174007","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}
Nano LettersPub Date : 2026-10-14DOI: 10.1021/acs.nanolett.6c02284
Zijian Zhou,Chun-Chih Tseng,Wenjun Zheng,Heng Wang,Heze Zhao,Christopher C. Homes,G. L. Carr,D. N. Basov,Yinming Shao,Matthew Yankowitz,Mengkun Liu,Lukas Wehmeier
{"title":"Broadband Near-Field\u0000Imaging of Strong Polariton Coupling\u0000in Graphene/CrI3 Heterostructures","authors":"Zijian Zhou,Chun-Chih Tseng,Wenjun Zheng,Heng Wang,Heze Zhao,Christopher C. Homes,G. L. Carr,D. N. Basov,Yinming Shao,Matthew Yankowitz,Mengkun Liu,Lukas Wehmeier","doi":"10.1021/acs.nanolett.6c02284","DOIUrl":"https://doi.org/10.1021/acs.nanolett.6c02284","url":null,"abstract":"Abstract Interfacial charge transfer in van der Waals heterostructures provides a powerful, contact-free mechanism to activate two-dimensional plasmons. Chromium iodide (CrI3), a layered ferromagnetic insulator, induces significant doping in adjacent graphene, yet its nanoscale polaritonic response and the optical manifestation of this charge transfer remain unexplored. Here, we report the direct real-space observation of propagating graphene surface plasmon polaritons (SPPs) sustained entirely by spontaneous interfacial charge transfer at the graphene/CrI3 interface. Interestingly, a distinct polaritonic anticrossing near 214 cm–1 (6.4 THz) between the charge-transfer-induced graphene SPP and the CrI3 phonon is identified, suggesting this hybrid system lies within the strong-coupling regime. Our work is enabled by the recent advances in broadband synchrotron near-field nanospectroscopy and suggests intriguing opportunities for magnetically switchable polaritonics in the hybrid charge-transfer heterostructures.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"42 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2026-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149209321","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}