Electron Extraction Optimization for Carbon‐Based Hole‐Conductor‐Free Perovskite Photovoltaics With Record 1.41 V <i>V</i><sub>OC</sub>
Carbon-based CsPbI<sub>2</sub>Br perovskite solar cells (PSCs) free of a hole-transport layer (HTL) have emerged as promising photovoltaics due to their low processing cost and superior stability. However, the voltage deficit resulting from inefficient carrier extraction causes insufficient power conversion efficiency (PCE), severely hindering their progress. Here, a gradient electron energy level modulation strategy proves effective in reducing voltage losses through the rapid extraction of photogenerated electrons. This process enhances carrier separation/collection and reduces recombination at the back contact, thereby achieving high-performance photovoltaics. It is demonstrated that the front electron extraction, equally critical as the prevailing back perovskite/carbon contact, accounts for the significant contributing factor of voltage deficit in carbon-based HTL-free PSCs. The resulting PSCs deliver a record open-circuit voltage (V<sub>OC</sub>) of 1.41 V and a PCE of 17.42% and retain more than 92% of their initial efficiency after 1, 000 h. These results highlight the significant potential of carbon-based HTL-free perovskite photovoltaics.
Authors
- Ruijie Ma (ORCID: https://orcid.org/0000-0002-7227-5164)
- Zhiwei Ren (ORCID: https://orcid.org/0000-0001-9674-0588)
- Xinhui Lu (ORCID: https://orcid.org/0000-0002-1908-3294)
- Qi Wei (ORCID: https://orcid.org/0000-0002-5322-3692)
- Heng Liu (ORCID: https://orcid.org/0000-0003-2458-5915)
- Mingjie Li (ORCID: https://orcid.org/0000-0003-0417-5089)
- Gang Li (ORCID: https://orcid.org/0000-0001-8399-7771)
- Han Yu (ORCID: https://orcid.org/0000-0003-1936-5328)
- Zhiqi Li (ORCID: https://orcid.org/0000-0001-8013-6108)
- Kuan Liu (ORCID: https://orcid.org/0000-0002-4874-141X)
- Tao Zhu (ORCID: https://orcid.org/0000-0001-9614-3476)
- Xiyun Xie
- Junyan Xiao (ORCID: https://orcid.org/0000-0003-1864-2928)
- Zhenhai Ai
Institutions
- Hong Kong Polytechnic University (HK)
- Chinese University of Hong Kong (HK)
- Wuhan University of Technology (CN)
Publication Details
- Journal
- Advanced Materials
- Published
- 2025-04-16
- DOI
- https://doi.org/10.1002/adma.202502436
- Citations
- 7
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 5.11
Funders
- Innovative Research Group Project of the National Natural Science Foundation of China
- National Natural Science Foundation of China
- Hong Kong Polytechnic University
- Innovation and Technology Commission - Hong Kong
- Guangdong Science and Technology Department
- Fondo Nacional de Ciencia Tecnología e Innovación
- Innovation and Technology Fund
- Hong Kong Branch of Southern Laboratory of Ocean Science and Engineering Guangdong Laboratory
- Intelligence Community Postdoctoral Research Fellowship Program
- Centro universitario di ricerca e formazione per lo sviluppo competitivo delle imprese del settore vitivinicolo italiano, Università degli Studi di Firenze
- Program for Top 100 Innovative Talents in Colleges and Universities of Hebei Province