Surface Management for Carbon-Based CsPbI2Br Perovskite Solar Cell with 14% Power Conversion Efficiency,Solar RRL

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Surface Management for Carbon-Based CsPbI2Br Perovskite Solar Cell with 14% Power Conversion Efficiency
Solar RRL ( IF 6.0 ) Pub Date : 2021-07-14 , DOI: 10.1002/solr.202100404
Fengyang Yu ₁ , Qianji Han ₁ , Liang Wang ₁ , Shuzhang Yang ₁ , Xiaoyong Cai ₂ , Chu Zhang ₃ , Tingli Ma ₃

Affiliation

Carbon-based hole transport material (HTM)-free CsPbI₂Br perovskite solar cells (C-PSCs) have garnered considerable attention due to their super thermal stability. The energy-level mismatch between the CsPbI₂Br perovskite and carbon electrodes, however, results in major energy loss and reduced power conversion efficiency (PCE) of C-PSCs. Herein, 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF₄) is used to manage the energy level, reduce defect densities, and improve the interface quality between CsPbI₂Br and carbon electrodes. Preliminary results demonstrate that the BMIMBF₄ modifier can passivate the surface defects of the perovskite film and reduce the energy-level mismatch between the CsPbI₂Br layer and the carbon electrode. A PCE of 14.03% is achieved by introducing BMIMBF₄ which is improved by 23% compared with the control device (11.37%). Moreover, stability—whether in the case of C-PSCs or CsPbI₂Br films—is also improved.

中文翻译：

功率转换效率为 14% 的碳基 CsPbI2Br 钙钛矿太阳能电池的表面管理

无碳基空穴传输材料 (HTM) 的 CsPbI ₂ Br 钙钛矿太阳能电池 (C-PSC) 由于其超强的热稳定性而备受关注。然而，CsPbI ₂ Br 钙钛矿和碳电极之间的能级失配会导致 C-PSC 的主要能量损失和功率转换效率 (PCE) 降低。在此，1-丁基-3-甲基咪唑鎓四氟硼酸盐（BMIMBF ₄）用于控制能级、降低缺陷密度并改善CsPbI ₂ Br 与碳电极之间的界面质量。初步结果表明，BMIMBF ₄改性剂可以钝化钙钛矿薄膜的表面缺陷并减少 CsPbI 之间的能级失配₂ Br层和碳电极。通过引入 BMIMBF ₄实现了 14.03% 的 PCE，与对照装置 (11.37%) 相比提高了 23%。此外，稳定性——无论是 C-PSC 还是 CsPbI ₂ Br 薄膜——也得到了改善。

更新日期：2021-09-09

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