Tailoring component incorporation for homogenized perovskite solar cells

Wenhan Yang ¹Junmin Xia ²Yuexin Lin ¹Hao Gu ³Fengqiang Ma ⁴Yumin Ren ⁵Fenqi Du ¹Dejian Yu ³Jinfeng Liao ³Yiwang Chen ⁶Guojia Fang ⁷Shengchun Yang ¹Chao Liang¹

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作者信息

1. MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter,School of Physics,National Innovation Platform(Center)for Industry-Education Integration of Energy Storage Technology,Xi'an Jiaotong University,Xi'an 710049,China
2. State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials(IAM),Nanjing University of Posts & Telecommunications,Nanjing 210023,China
3. Joint Key Laboratory of the Ministry of Education,Institute of Applied Physics and Materials Engineering,University of Macau,Macao 999078,China
4. Shandong Zhixin Intelligent Equipment Co.,LTD,Jinan 250101,China
5. School of Chemistry,Xi'an Jiaotong University,Xi'an 710049,China
6. National Engineering Research Center for Carbohydrate Synthesis,Key Laboratory of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education,Jiangxi Normal University,Nanchang 330022,China
7. Key Laboratory of Artificial Micro/Nano Structures of Ministry of Education,School of Physics and Technology,Wuhan University,Wuhan 430072,China
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Abstract

Deep-level traps at the buried interface of perovskite and energy mismatch problems between the per-ovskite layer and heterogeneous interfaces restrict the development of ideal homogenized films and effi-cient perovskite solar cells(PSCs)using the one-step spin-coating method.Here,we strategically employed sparingly soluble germanium iodide as a homogenized bulk in-situ reconstruction inducing material preferentially aggregated at the perovskite buried interface with gradient doping,markedly reducing deep-level traps and withstanding local lattice strain,while minimizing non-radiative recombi-nation losses and enhancing the charge carrier lifetime over 9 μs.Furthermore,this gradient doping assisted in modifying the band diagram at the buried interface into a desirable flattened alignment,sub-stantially mitigating the energy loss of charge carriers within perovskite films and improving the carrier extraction equilibrium.As a result,the optimized device achieved a champion power conversion effi-ciency of 25.24％with a fill factor of up to 84.65％,and the unencapsulated device also demonstrated excellent light stability and humidity stability.This work provides a straightforward and reliable homog-enization strategy of perovskite components for obtaining efficient and stable PSCs.

Key words

Homogenized perovskite films/Lattice strain relaxation/Deep-level traps/Carrier extraction equilibrium/Perovskite solar cells

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基金项目

National Natural Science Foundation of China(62105292)

Shaanxi Fundamental Science Research Project for Mathematics and Physics(22JSY015)

Young Talent Fund of Xi'an Association for Science and Technology(959202313020)

Natural Science Foundation of Shaanxi Province(2021GXLH-Z-0)

Natural Science Foundation of Shaanxi Province(2020JZ-02)

project of Innovative Team of Shaanxi Province(2020TD-001)

China Fundamental Research Funds for the Central Universities()

出版年

2024

科学通报(英文版)

中国科学院

科学通报(英文版)

CSTPCD

ISSN：1001-6538

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