热处理对铋基钙钛矿太阳能电池性能的影响

Effect of Heat Treatment on Performance of Perovskite Solar Cells

摘要: 铅基钙钛矿太阳能电池自发现以来，光电转换效率急速上升，由3.8%迅速提高到25.2%。然而，铅基钙钛矿太阳能电池的毒性和不稳定性严重制约该类电池的商业化的发展。Cs₂AgBiBr₆双钙钛矿类电池具有良好的高温稳定性，因此获得了科学家们的广泛关注。本研究采用溶剂热法合成Cs₂AgBiBr₆粉末，再经由真空蒸镀，制备了高度致密性的薄膜；薄膜经过310℃退火处理后，可增进薄膜结晶质量，有利于电池性能的提升。因而，电池器件具有较小的串联电池R_s和较大的分流电阻R_sh，电池内部能量消耗降低，最佳器件的PCE为0.393%，对应的J_sc为0.84 mA/cm²，V_oc为0.79 V，FF为59.3%，R_s为0.09 Ω/cm²，R_sh为3.61 Ω/cm²。

Abstract: Since the discovery of perovskite solar cells, the photoelectric conversion efficiency has rapidly increased from 3.8% to 25.2%. However, the toxicity and instability of lead-based perovskite solar cells severely limit their commercialization. The Cs₂AgBiBr₆ double perovskite has attracted extensive attention due to its high temperature qualitative properties. In this paper, Cs₂AgBiBr₆ powder was synthesized by solvothermal method, and then the film with high density was prepared by vacuum evaporation method. Through the heat treatment of the thin film, it is found that when annealing at 310˚C, the film has the best crystallinity. The prepared cell device based on this condition obtains smaller R_s and larger R_sh, and the energy consumption in the cell is minimum. The optimal PCE of the final device is 0.393%, the corresponding J_sc is 0.84 mA/cm², V_oc is 0.79 V, FF is 59.3%, R_s is 0.09 Ω/cm², and R_sh is 3.61 Ω/cm².