Optimization of crystallization dynamics in wide-bandgap bromine–iodine perovskite films for high-performance perovskite–organic tandem solar cells

Zonglong Song; Jiangfeng Wang; Yuqi Bao; Jie Zeng; Deng Wang; Jiang He; Peide Zhu; Bo Jiang; Zhixin Liu; Siru He; Yanna Hou; Ziyang Hu; Chen Xie; Yongsheng Chen; Yongsheng Liu; Xingzhu Wang; Baomin Xu

doi:10.1039/D5EE00264H

Optimization of crystallization dynamics in wide-bandgap bromine–iodine perovskite films for high-performance perovskite–organic tandem solar cells†

Zonglong Song,‡^a Jiangfeng Wang,‡^a Yuqi Bao,^a Jie Zeng,^a Deng Wang,^a Jiang He,^a Peide Zhu,^a Bo Jiang,^a Zhixin Liu,^a Siru He,^a Yanna Hou,^g Ziyang Hu,

^g Chen Xie,

^h Yongsheng Chen,

^f Yongsheng Liu,

*^ef Xingzhu Wang*^abcd and Baomin Xu

*^ab

Author affiliations

* Corresponding authors

^a Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, China

^b Department of Materials Science and Engineering, Shenzhen Engineering Research and Development Center for Flexible Solar Cells, and SUSTech Energy Institute for Carbon Neutrality, Southern University of Science and Technology, Shenzhen, China
E-mail: xubm@sustech.edu.cn

^c Shenzhen Putai Technology Co., Ltd, Shenzhen, China
E-mail: wangxz@sustech.edu.cn

^d School of Electrical Engineering, University of South China, Hengyang, China

^e The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials, Institute of Polymer Chemistry, College of Chemistry and Renewable Energy Conversion and Storage Center (RECAST), Nankai University, Tianjin, China

^f The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials, Institute of Polymer Chemistry, College of Chemistry and Renewable Energy Conversion and Storage Center (RECAST), Nankai University, Tianjin, China
E-mail: liuys@nankai.edu.cn

^g Department of Microelectronic Science and Engineering, School of Physical Science and Technology, Ningbo University, Ningbo, China

^h College of New Materials and New Energies, Shenzhen Technology University, Shenzhen, China

Abstract

The development of efficient and stable wide-bandgap (WBG) bromine–iodine halide perovskites (Br > 20%) is crucial for enhancing the performance of tandem solar cells. Nonetheless, phase separation of I–Br in WBG perovskites under illumination and heating significantly hinders the advancement of tandem devices. This phenomenon is primarily attributed to the uneven spatial distribution of halide ions in WBG films. Moroxydine hydrochloride was introduced into 1.85 eV I–Br mixed WBG perovskite films, effectively optimizing the crystallization dynamics of the perovskite and improving the film stability. Through this approach, a 1.85 eV WBG perovskite solar cell (PSC) was successfully fabricated, achieving a power conversion efficiency (PCE) of 18.76%, an open-circuit voltage (V_OC) of 1.387 V, and remarkable operational stability. When applied to perovskite–organic tandem solar cells, this method led to devices with a PCE of 25.98% and a V_OC of 2.210 V, setting a new record for the highest V_OC reported to date.

Energy & Environmental Science

Optimization of crystallization dynamics in wide-bandgap bromine–iodine perovskite films for high-performance perovskite–organic tandem solar cells†

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Optimization of crystallization dynamics in wide-bandgap bromine–iodine perovskite films for high-performance perovskite–organic tandem solar cells

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