DataVXACS Energy LettersPaper
journal article·2026-07-02

Thermally Co-Evaporated Wide-Bandgap Perovskite Photovoltaics via BaI 2 Vapor Surface Treatment

Chong Dong, Shuwen Yan, Rui Qiu, Peiyan Zhang, Xuke Yang, Haojun Hu, Lili Cheng, Ling Xu, Luying Li, Hongyan Lu, Sheng He, Haisheng Song, Qi Xiao, Chao Chen, Jiang Tang

ACS Energy Letters
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Source abstract

Abstract

Thermally evaporated wide-bandgap perovskite subcells offer distinct advantages for perovskite-silicon tandem photovoltaics, particularly regarding conformal deposition on textured silicon and industrial compatibility. However, these devices suffer from severe open-circuit voltage ( V oc ) losses, limiting their efficiency improvement and potential in tandem applications. This study elucidates that Pb–I diatomic vacancy and iodine single-atomic vacancy on the Cs-rich but Pb-poor surface of thermally evaporated Cs 0.94 DMA 0.06 PbI 3 films are the primary origin of V oc loss, although these defects are benign for surface phase stability. Therefore, a non-destructive surface passivation strategy through BaI 2 vapor is proposed without altering the lattice structure that induces phase transformation. This approach successfully suppresses surface defect-induced non-radiative recombination, achieving a significant enhancement in V oc (1.166 V) and a device efficiency of 18.15%. This achievement sets a new efficiency record for thermally evaporated wide-bandgap perovskite solar cells with a bandgap over 1.7 eV, paving the way for tandem photovoltaic applications.
Source: openalex_inverted_index · Quality: baseline

Research context

Electronic materialsMaterials processing

OpenAlex topics: Perovskite Materials and Applications · solar cell performance optimization · Ga2O3 and related materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Air Force Early Warning Academy

Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information (SOEI), Huazhong University of Science and Technology

Department of Mechanical and Electrical Engineering

Wenhua College

DR Laser Technology (Wuxi) Co., Ltd.

Astronergy R&D Center

Key Laboratory of Flexible Optoelectronic Materials and Technology (Ministry of Education), School of Optoelectronic Materials & Technology

Jianghan University

Hubei Optical Fundamental Research Center

Jiangsu Engineering Research Center of Light-Electricity-Heat Energy-Converting Materials and Applications, School of Materials Science and Engineering

Changzhou University

Optical Valley Laboratory

Funding

Natural Science Foundation of Hubei Province · National Natural Science Foundation of China · Guangdong Provincial Key Laboratory of Manufacturing Equipment Digitization · Jiangsu Research Center of Light-Electricity-Heat Energy-Converting Materials and Applications, Changzhou University · Natural Science Foundation of Wuhan · Wuhan Municipal Education Bureau · Optics Valley Laboratory · Hubei Optical Fundamental Research Center · Hubei Province · Wuhan Science and Technology Innovation Bureau · Wuhan City

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