2D perovskites exhibit limited charge transfer and a stable unsymmetrical structure. Hence, a 2D perovskite solar cell (PSC) is more stable but less efficient than a 3D PSC. An effective combination of good stability and high power conversion efficiency (PCE) is desirable in PSCs. A novel diaminobenzene dihydroiodide-MA_0.6FA_0.4PbI_3−xCl_x analogous 2D unsymmetrical perovskite is designed to further enhance PSC performance. The two amino groups of diaminobenzene dihydroiodide (DD) function similarly as the amino groups of methylammonium and formamidinium ions. Therefore, diaminobenzene dihydroiodide can replace methylammonium and formamidinium and create better bonding interaction with the lead trihalide. The analogous 2D unsymmetrical perovskite not only possesses sufficient charge transfer but also exhibits high stability with an appropriate incorporation of DD. Noticeably, the champion device shows a PCE of 22.34%, setting a new record for an MAPbI_3−xCl_x based PSC. The thermal, illumination, and environmental stability is enhanced by 20%–30%. The improved PCE and stability is attributed to better charge transfer and stable structure.

中文翻译：

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用于高稳定性太阳能电池的二氨基苯二氢碘化物-MA0.6FA0.4PbI3−xClx 不对称钙钛矿效率超过 22%

二维钙钛矿表现出有限的电荷转移和稳定的不对称结构。因此，2D 钙钛矿太阳能电池 (PSC) 比 3D PSC 更稳定但效率更低。PSC 需要良好的稳定性和高功率转换效率 (PCE) 的有效组合。一种新型二氨基苯二氢碘化物-MA _0.6 FA _0.4 PbI _{3− x} Cl _x类似的二维非对称钙钛矿旨在进一步提高 PSC 性能。二氨基苯二氢碘化物 (DD) 的两个氨基的功能类似于甲基铵和甲脒离子的氨基。因此，二氨基苯二氢碘化物可以代替甲基铵和甲脒，与三卤化铅产生更好的键合作用。类似的二维不对称钙钛矿不仅具有足够的电荷转移，而且在适当掺入 DD 的情况下表现出高稳定性。值得注意的是，冠军器件的 PCE 为 22.34%，创下 MAPbI _{3− x} Cl _{x的新纪录}基于 PSC。热稳定性、光照稳定性和环境稳定性提高了 20%–30%。改进的 PCE 和稳定性归因于更好的电荷转移和稳定的结构。