退火温度对碳基全无机钙钛矿太阳能电池性能的影响

Effect of Annealing Temperature on the Performance of Carbon-Based All-Inorganic Perovskite Solar Cells

摘要:

碳基全无机钙钛矿太阳能电池(carbon-based all-inorganic perovskite solar cells, C-PSCs)由于成本低、热稳定性好等优点逐渐引起人们的广泛关注，然而其效率要远低于传统的钙钛矿太阳能电池(perovskite solar cells, PSCs)。通过调控CsPbI₂Br薄膜的退火温度，改善薄膜质量。利用SEM、XRD表征分析了钙钛矿薄膜微观形貌以及物相结构，发现升高退火温度可有效提高CsPbI₂Br薄膜的结晶性从而减少其表面的孔洞。升高钙钛矿薄膜的退火温度，器件的光伏性能有显著提高，短路电流密度(J_sc)从8.84 mA·cm^-2提高至12.14 mA·cm^-2，开路电压(V_oc)从0.93 V提高至1.06 V，最终能量转换效率(PCE)从2.75%提高至7.63%。研究结果表明，优化钙钛矿太阳能电池的制备工艺可以有效提高其光伏性能。

Abstract:

Carbon-based all-inorganic perovskite solar cells （C-PSCs） have gradually been attracted due to their low cost and good thermal stability， however， their efficiency is much lower than that of traditional perovskite solar cells. In this paper， the annealing temperature of CsPbI₂Br thin films was regulated to improve the quality of the films. The microscopic morphology and phase structure of the perovskite films were characterized by SEM and XRD. It was found that the increase of annealing temperature could effectively improve the crystallinity of the CsPbI₂Br films， thereby reducing the surface pores and the non-radiative recombination rate of carriers. Increasing the annealing temperature of the perovskite thin films significantly improves the photovoltaic performance of the device， the short-circuit current density （J_sc） increases from 8.84 mA·cm^-2 to 12.14 mA·cm^-2， the open-circuit voltage （V_oc） increases from 0.93 V to 1.06 V， and the final power conversion efficiency （PCE） increased from 2.75% to 7.63%. The results show that optimizing the preparation process of perovskite solar cells can effectively improve their photovoltaic performance， which is an effective and feasible solution.