MAPbI3 钙钛矿太阳能电池的结晶和缺陷化学双重工程，效率接近 22%,ACS Sustainable Chemistry & Engineering

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MAPbI3 钙钛矿太阳能电池的结晶和缺陷化学双重工程，效率接近 22%
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2022-12-12 , DOI: 10.1021/acssuschemeng.2c05816
Chen Wang ₁ , Zihan Zhu ₁ , Ge Wang ₁ , Xiangxu Ding ₁ , Yi Chen ₁ , Songwen Xiao ₁ , Xin Liu ₁ , Xiaoyu Zhang ₂ , Shanpeng Wen ₁

Affiliation

甲基铵三碘化铅 (MAPI) 一直是钙钛矿太阳能电池最常用的光吸收层，并且还显示出潜在的高理论效率。然而，迄今为止可实现的效率仍然落后于甲脒基或混合阳离子基对应物。在这项工作中，双添加剂 2-巯基吡啶 (2-MP) 和 1,2-二氯苯 (DCB) 用于调节晶体取向，产生高晶体质量的 MAPI 薄膜并钝化薄膜的陷阱状态。令人鼓舞的是，我们能够区分这两种添加剂的功效。DCB 有效地减小了钙钛矿前驱体中胶体团簇的尺寸，从而帮助湿膜达到临界浓度以启动快速成核。由此产生的 MAPI 薄膜表现出更大的晶粒尺寸，具有更强的晶粒取向和更光滑的表面。随后引入 2-MP，保持了高晶体质量，并且 2-MP 与未配位的 Pb 缺陷相互作用并钝化了相关的陷阱。双增材处理器件表现出 21.83% 的冠军效率，同时具有高J _sc为 24.01 mA/cm ²和V _oc为 1.15 V。这项工作提供了一种方法来设计结晶质量和缺陷化学，以实现高效的 MAPbI ₃钙钛矿太阳能电池。

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Crystallization and Defect Chemistry Dual Engineering for MAPbI3 Perovskite Solar Cells with Efficiency Approaching 22%

Methylammonium lead triiodide (MAPI) has been the most commonly used light absorber layer for perovskite solar cells and also shows potentially high theoretical efficiency. However, the achievable efficiencies so far still lag behind those of their formamidinium- or mixed cation-based counterparts. In this work, the dual additives 2-mercaptopyridine (2-MP) and 1,2-dichlorobenzene (DCB) are applied to regulate the crystal orientation, yielding a high-crystal quality MAPI film and passivating the trap states of the film. Encouragingly, we are able to distinguish the efficacy of the two additives. DCB effectively reduced the size of colloidal clusters in the perovskite precursor, thus helping the wet film reach the critical concentration to initialize rapid nucleation. The resulting MAPI film exhibited extended grain size with a stronger grain orientation and smoother surface. With the subsequent introduction of 2-MP, the high crystal quality was maintained, and 2-MP interacted with uncoordinated Pb defects and passivated the related traps. The dual additive-processed devices exhibited the champion efficiency of 21.83% with a simultaneously high J_sc of 24.01 mA/cm² and V_oc of 1.15 V. This work provides a means to engineer the crystallization quality and defect chemistry toward efficient MAPbI₃ perovskite solar cells.

更新日期：2022-12-12

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