{"title":"Tailoring Thick Film Crystallization and Facet Orientation via Potassium Acetate for Efficient Bifacial Perovskite Solar Cells","authors":"Xianggang Chen, Miao Yang, Xiaoxu Sun, Xing Li, Yuhang Xie, Xuzheng Feng, Jixiang Tang, Longfei Yan, Shuyuan Fan, Songyuan Dai, Wenzhong Shen, Molang Cai","doi":"10.1021/acsenergylett.5c01603","DOIUrl":null,"url":null,"abstract":"Bifacial perovskite solar cells (PSCs) require micron-thick perovskite layers to compensate for optical loss from transparent electrodes, but high defect densities limit efficiency. Here, we introduce a potassium acetate (KAc) post-treatment on microthick PbI<sub>2</sub> films to form an amorphous KAc-PbI<sub>2</sub> intermediate, which facilitates ammonium salt incorporation and promotes perovskite crystallization. During the second step, released Ac<sup>–</sup> and K<sup>+</sup> ions selectively adsorb onto (111) and (001) facets, respectively, directing vertical crystal growth with (001) orientation. This strategy reduces defect density and improves film quality in thick perovskite layers. As a result, the bifacial PSC achieves a power conversion efficiency (PCE) of 21.33%, bifaciality exceeding 80%, and a record power generation density (PGD) of 24.72 mW cm<sup>–2</sup> under 0.2 albedo, representing the highest reported PGD for n-i-p bifacial PSCs. After 500 h of continuous illumination at the maximum power point, the KAc-treated bifacial device retained its initial PCE.","PeriodicalId":16,"journal":{"name":"ACS Energy Letters ","volume":"46 1","pages":""},"PeriodicalIF":18.2000,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Energy Letters ","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1021/acsenergylett.5c01603","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
Bifacial perovskite solar cells (PSCs) require micron-thick perovskite layers to compensate for optical loss from transparent electrodes, but high defect densities limit efficiency. Here, we introduce a potassium acetate (KAc) post-treatment on microthick PbI2 films to form an amorphous KAc-PbI2 intermediate, which facilitates ammonium salt incorporation and promotes perovskite crystallization. During the second step, released Ac– and K+ ions selectively adsorb onto (111) and (001) facets, respectively, directing vertical crystal growth with (001) orientation. This strategy reduces defect density and improves film quality in thick perovskite layers. As a result, the bifacial PSC achieves a power conversion efficiency (PCE) of 21.33%, bifaciality exceeding 80%, and a record power generation density (PGD) of 24.72 mW cm–2 under 0.2 albedo, representing the highest reported PGD for n-i-p bifacial PSCs. After 500 h of continuous illumination at the maximum power point, the KAc-treated bifacial device retained its initial PCE.
ACS Energy Letters Energy-Renewable Energy, Sustainability and the Environment
CiteScore
31.20
自引率
5.00%
发文量
469
审稿时长
1 months
期刊介绍:
ACS Energy Letters is a monthly journal that publishes papers reporting new scientific advances in energy research. The journal focuses on topics that are of interest to scientists working in the fundamental and applied sciences. Rapid publication is a central criterion for acceptance, and the journal is known for its quick publication times, with an average of 4-6 weeks from submission to web publication in As Soon As Publishable format.
ACS Energy Letters is ranked as the number one journal in the Web of Science Electrochemistry category. It also ranks within the top 10 journals for Physical Chemistry, Energy & Fuels, and Nanoscience & Nanotechnology.
The journal offers several types of articles, including Letters, Energy Express, Perspectives, Reviews, Editorials, Viewpoints and Energy Focus. Additionally, authors have the option to submit videos that summarize or support the information presented in a Perspective or Review article, which can be highlighted on the journal's website. ACS Energy Letters is abstracted and indexed in Chemical Abstracts Service/SciFinder, EBSCO-summon, PubMed, Web of Science, Scopus and Portico.