Synchronous Phase Transformation for Efficient Wide-Bandgap Perovskite Photovoltaics.

IF 27.4 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Advanced Materials Pub Date : 2025-07-18 DOI:10.1002/adma.202505694

Yifan Li,Xinmin Zhao,Ni Meng,Shuo Dong,Shan Yan,Man Yang,Changjiu Sun,Zhiqiang Li,Shaopeng Yang,Mingjian Yuan,Tingwei He

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Abstract

Mixed-halogen wide-bandgap (WBG) perovskite materials are employed in tandem solar cells (TSCs) due to their continuous tunability of bandgap. However, inhomogeneous halogen phases are often observed in bromine-rich perovskite films, which restricts the performance of WBG perovskite solar cells (PSCs) and TSCs. Here, homogeneous halogen-phase perovskite is proposed to form film by a synchronous halogen-phase transformation strategy. 1,3-Dimethyl-2-imidazolidinone (DMI) is introduced into the perovskite precursor solution, due to its stronger binding energy with lead halide (PbX2). The homogeneous DMI-PbX2 adducted intermediate phase is stable in precursor solution and at spin-coating stage. And it then synchronously transforms into a homogeneous halide-phase perovskite film at the annealing stage. Benefited from efficient carrier extraction and suppressed carrier recombination, the resulting 1.76 eV-bandgap PSC achieves a record power conversion efficiency (PCE) of 21.42% (certified 21.18%) among devices with a bandgap wider than 1.74 eV. Based on the high transmittance of semitransparent-WBG PSC, a 4-terminal all-perovskite TSC achieves a PCE of 29.66%.

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高效宽禁带钙钛矿光伏电池的同步相变。

混合卤素宽禁带钙钛矿材料由于其禁带的连续可调性而被广泛应用于串联太阳能电池中。然而，在富溴钙钛矿薄膜中经常观察到不均匀的卤素相，这限制了WBG钙钛矿太阳能电池（PSCs）和TSCs的性能。本文提出采用同步卤素相变策略制备均匀卤素相钙钛矿成膜。将1,3-二甲基-2-咪唑烷酮（DMI）引入到钙钛矿前驱体溶液中，因为它与卤化铅（PbX2）的结合能更强。均相的DMI-PbX2中间相在前驱体溶液和旋涂阶段稳定。然后在退火阶段同步转变为均匀的卤化物相钙钛矿膜。得益于高效的载流子提取和抑制载流子重组，由此产生的1.76 eV带隙PSC在带隙大于1.74 eV的器件中实现了创纪录的21.42%（经认证为21.18%）的功率转换效率（PCE）。基于半透明wbg PSC的高透光率，四端全钙钛矿TSC的PCE达到29.66%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Advanced Materials 工程技术-材料科学：综合

CiteScore

43.00

自引率

4.10%

发文量

2182

审稿时长

2 months

期刊介绍： Advanced Materials, one of the world's most prestigious journals and the foundation of the Advanced portfolio, is the home of choice for best-in-class materials science for more than 30 years. Following this fast-growing and interdisciplinary field, we are considering and publishing the most important discoveries on any and all materials from materials scientists, chemists, physicists, engineers as well as health and life scientists and bringing you the latest results and trends in modern materials-related research every week.