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yexuqing木虫之王 (文学泰斗)
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光转换稳定剂助力高效钙钛矿-有机叠层太阳能电池
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Perovskite–organic tandem solar cells with a photo-transformable stabilizer 光转换稳定剂助力高效钙钛矿-有机叠层太阳能电池 ▲ 作者：Ruihan Wu, Shucheng Qin, Tianwei Zou, Xin Jiang, Senyao Wang, Siyu Zhuang, et al. ▲链接： https://www.nature.com/articles/s41586-026-10869-x ▲摘要： 宽禁带（WBG）混合卤化物钙钛矿具有高溴（Br）含量，用作钙钛矿—有机叠层太阳能电池（TSC）的前电池材料，但往往存在初始卤化物混合不均匀以及光致卤化物偏析的问题，限制了钙钛矿-有机TSC的性能。 研究组将一种光转换添加剂4-[3-(三氟甲基)-3H-二氮杂环丙烯-3-基]苄基铵盐（TDB）引入WBG钙钛矿前驱体溶液中，以建立一种两阶段策略来稳定混合卤化物相。在结晶过程中，TDB通过抑制富Br相的快速析出并加速退火过程中的卤化物混合，改善了初始卤化物的均匀性。 在运行光照条件下，TDB发生转化，形成一种对钙钛矿晶界表面具有更强吸附作用的新物种，抑制了与碘化物相关的缺陷形成，并抑制了缺陷辅助的载流子捕获和离子迁移，从而减缓了光致卤化物偏析。 具有代表性的WBG钙钛矿（带隙能量（Eg）=1.88 eV）太阳能电池实现了20.01%的功率转换效率（PCE），开路电压为1.42 V，填充因子为85.13%，且在光照下稳定性得到改善。 将该WBG钙钛矿太阳能电池集成到单片钙钛矿—有机TSC中，研究组获得了28.80%的PCE，经认证的稳态PCE为28.04%。该钙钛矿—有机TSC在ISOS-L-1标准协议下运行625小时后，仍保持其初始PCE的90%。 ▲ Abstract： Wide-bandgap (WBG) mixed-halide perovskites with high bromine (Br) content, which are used as the front-cell material in perovskite–organic tandem solar cells (TSCs), often exhibit initial halide-mixing inhomogeneity and light-induced halide segregation, limiting the performance of perovskite–organic TSCs. Here we introduce a photo-transformable additive, 4-[3-(trifluoromethyl)-3H-diazirin-3-yl]benzylammonium salt (TDB), into the WBG perovskite precursor solution to establish a two-stage strategy for stabilizing the mixed-halide phase. During crystallization, TDB improves the initial halide homogeneity by suppressing the rapid precipitation of the Br-rich phase and accelerating halide mixing upon annealing. During operational illumination, TDB undergoes transformation to form a new species with stronger adsorption on the perovskite grain-boundary surfaces, which inhibits the formation of iodide-related defects and suppresses defect-assisted carrier trapping and ion migration, thereby mitigating light-induced halide segregation. The representative WBG perovskite (bandgap energy （Eg）=1.88 eV solar cell had a power conversion efficiency (PCE) of 20.01%, with an open-circuit voltage of 1.42 V, a fill factor of 85.13% and improved stability under illumination. By integrating the WBG perovskite solar cell into a monolithic perovskite–organic TSC, we achieved a PCE of 28.80%, with a certified steady-state PCE of 28.04%. The perovskite–organic TSC retained 90% of its initial PCE after 625 h of operation under the ISOS-L-1 protocol. |
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