{"title":"Surface sulfidation constructing gradient heterojunctions for high-efficiency (approaching 18%) HTL-free carbon-based inorganic perovskite solar cells","authors":"Xiaonan Huo, Jinqing Lv, Kexiang Wang, Weiwei Sun, Weifeng Liu, Ran Yin, Yansheng Sun, Yukun Gao, Tingting You, Penggang Yin","doi":"10.1002/cey2.586","DOIUrl":null,"url":null,"abstract":"Due to the advantages of cost-effectiveness and tunable band gap, hole transport layer (HTL)-free CsPbI<sub><i>X</i></sub>Br<sub>3−<i>X</i></sub> carbon-based inorganic perovskite solar cells (C-IPSCs) are emerging candidates for both single junction and tandem solar cells. Because of the direct contact between the carbon electrode and the perovskite surface, energy barriers and defects at the interface limit the enhancement of power conversion efficiency (PCE). In this work, we first reported a preparation method of CsPbI<sub>2.75</sub>Br<sub>0.25</sub> HTL-free C-IPSCs and developed an effective surface sulfidation regulation (SSR) strategy to promote hole extraction and inhibit non-radiative recombination of inorganic perovskite by 2-(thiocyanomethylthio)benzothiazole (TCMTB) surface modification. The introduced S<sup>2−</sup> anions form strong binding with uncoordinated Pb ions, inhibit the perovskite degradation reaction, and effectively passivate the surface defects. In addition, PbS formed by the SSR strategy constructed a gradient heterojunction, which promoted the arrangement energy levels and enhanced hole extraction. An additional back-surface field is induced at the interface of perovskite by energy band bending, which increases the open-circuit voltage (V<sub>OC</sub>). As a result, the SSR-based CsPbI<sub>2.75</sub>Br<sub>0.25</sub> HTL-free C-IPSCs showed a PCE of 17.88% with a fill factor of 81.56% and V<sub>OC</sub> of 1.19 V, which was among the highest reported values of CsPbI<sub>2.75</sub>Br<sub>0.25</sub> HTL-free C-IPSCs.","PeriodicalId":33706,"journal":{"name":"Carbon Energy","volume":"28 1","pages":""},"PeriodicalIF":19.5000,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Carbon Energy","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1002/cey2.586","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Due to the advantages of cost-effectiveness and tunable band gap, hole transport layer (HTL)-free CsPbIXBr3−X carbon-based inorganic perovskite solar cells (C-IPSCs) are emerging candidates for both single junction and tandem solar cells. Because of the direct contact between the carbon electrode and the perovskite surface, energy barriers and defects at the interface limit the enhancement of power conversion efficiency (PCE). In this work, we first reported a preparation method of CsPbI2.75Br0.25 HTL-free C-IPSCs and developed an effective surface sulfidation regulation (SSR) strategy to promote hole extraction and inhibit non-radiative recombination of inorganic perovskite by 2-(thiocyanomethylthio)benzothiazole (TCMTB) surface modification. The introduced S2− anions form strong binding with uncoordinated Pb ions, inhibit the perovskite degradation reaction, and effectively passivate the surface defects. In addition, PbS formed by the SSR strategy constructed a gradient heterojunction, which promoted the arrangement energy levels and enhanced hole extraction. An additional back-surface field is induced at the interface of perovskite by energy band bending, which increases the open-circuit voltage (VOC). As a result, the SSR-based CsPbI2.75Br0.25 HTL-free C-IPSCs showed a PCE of 17.88% with a fill factor of 81.56% and VOC of 1.19 V, which was among the highest reported values of CsPbI2.75Br0.25 HTL-free C-IPSCs.
期刊介绍:
Carbon Energy is an international journal that focuses on cutting-edge energy technology involving carbon utilization and carbon emission control. It provides a platform for researchers to communicate their findings and critical opinions and aims to bring together the communities of advanced material and energy. The journal covers a broad range of energy technologies, including energy storage, photocatalysis, electrocatalysis, photoelectrocatalysis, and thermocatalysis. It covers all forms of energy, from conventional electric and thermal energy to those that catalyze chemical and biological transformations. Additionally, Carbon Energy promotes new technologies for controlling carbon emissions and the green production of carbon materials. The journal welcomes innovative interdisciplinary research with wide impact. It is indexed in various databases, including Advanced Technologies & Aerospace Collection/Database, Biological Science Collection/Database, CAS, DOAJ, Environmental Science Collection/Database, Web of Science and Technology Collection.