Surface Reconstruction for Tin-Based Perovskite Solar Cells,ACS Energy Letters

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Surface Reconstruction for Tin-Based Perovskite Solar Cells
ACS Energy Letters ( IF 19.3 ) Pub Date : 2022-10-14 , DOI: 10.1021/acsenergylett.2c01624
Hui Li ₁ , Bohong Chang ₁ , Lian Wang ₁ , Zhongxiao Wang ₁ , Lu Pan ₁ , Yutong Wu ₁ , Zhen Liu ₁ , Longwei Yin ₁

Affiliation

Open-circuit voltage loss and instability from surface Sn(II) oxidation and high-density Sn vacancies pose great hurdles for developing high-performance Sn-based perovskite solar cells (PSCs). Turning attention from the bulk microstructure to surface reconstruction is promising to push the performance enhancement of Sn-based PSCs. Herein, a surface-modulation strategy based on 6-maleimidohexanehydrazide trifluoroacetate is rationally designed to reconstruct the surface structure of FASnI₃ films to manage the Fermi level and passivate defects. The electronic state evolution results in an n-type Fermi level shift of the shallow surface, thereby forming an extra back-surface field for electron extraction. Meanwhile, the ion-pairing agent affords passivating cationic and anionic defects, thereby nullifying the charged-defect-rich surface. In particular, the reductive hydrazide group and carboxyl groups alleviate superficial Sn(IV) and inhibit Sn(IV) formation, homogenizing surface potential and prolonging carrier lifetime. Accordingly, devices deliver a champion power conversion efficiency (PCE) of 13.64% and an elongated lifespan, with over 75% of the original PCE after 1000 h of illumination (O₂ < 50 ppm). This work presents a new insight on the surface reconstruction strategy for developing high-performance Sn-based PSCs.

中文翻译：

锡基钙钛矿太阳能电池的表面重建

表面 Sn(II) 氧化和高密度 Sn 空位导致的开路电压损失和不稳定性对开发高性能 Sn 基钙钛矿太阳能电池 (PSC) 构成了巨大障碍。将注意力从整体微观结构转向表面重建有望推动 Sn 基 PSC 的性能提升。在此，基于 6-马来酰亚胺己酰肼三氟乙酸盐的表面调节策略被合理设计以重建 FASnI _{3的表面结构。}薄膜来管理费米能级和钝化缺陷。电子态演化导致浅表面的 n 型费米能级位移，从而形成用于电子提取的额外背面场。同时，离子对剂提供钝化的阳离子和阴离子缺陷，从而消除了富含带电缺陷的表面。特别是，还原性酰肼基团和羧基可减轻表面 Sn(IV) 并抑制 Sn(IV) 的形成，使表面电位均匀化并延长载流子寿命。因此，器件提供 13.64% 的冠军功率转换效率 (PCE) 和更长的使用寿命，在 1000 小时光照 (O ₂< 50 ppm）。这项工作为开发高性能 Sn 基 PSC 的表面重建策略提供了新的见解。

更新日期：2022-10-14

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