丙基碘化铵掺杂制备稳定高效的FAPbI_(3)钙钛矿太阳能电池

Propylammonium iodide doping in enhanced stability and performance of FAPbI_(3) perovskite for photovoltaics

黑色的α相甲脒铅碘(α-FAPbI_(3))由于其出色的光电性质在光伏领域受到广泛关注。然而,α-FAPbI_(3)在室温下容易转变为没有光学活性的黄色相(δ-FAPbI_(3)),降低器件的光伏性能和稳定性。通过在FAPbI_(3)前驱液中掺杂丙基碘化铵(PAI),在空气气氛下制备纯α-FAPbI_(3)薄膜。研究发现,PAI掺杂可以抑制α-FAPbI_(3)的相转变而不改变其光学带隙。同时,PAI掺杂后的FAPbI_(3)薄膜的晶体质量、器件光伏性能和稳定性均得到显著提升。掺杂1.0%(摩尔分数)PAI的FAPbI_(3)钙钛矿电池,其光电转换效率达到22.6%。结果表明PAI掺杂是提高α-FAPbI_(3)钙钛矿电池光伏性能和稳定性的一种有效策略。

Hybrid perovskite FAPbI_(3)is regarded as a promising absorber material for photovoltaic solar cells owing to its ideal bandgap and outstanding photoelectric properties.However,inherent phase instability of black perovskite(α-FAPbI_(3))at room temperature remains a big obstacle for its application in photovoltaics.Herein,pureα-FAPbI_(3)thin films were prepared in air atmosphere by doping propylammonium iodide(PAI)in FAPbI_(3)precursor solution.It is found that the doping of PAI can inhibit the formation of the undesiredδ-FAPbI_(3),enhance the crystallinity and light absorbability,without widening the optical bandgap.Meanwhile,the photovoltaic performance and stability of the PAI-doped FAPbI_(3)films are significantly improved.As a result,the device doped with 1.0%(molar fraction)PAI achieved the best photoelectric conversion efficiency(PCE)of 22.6%,PAI doping is an effective strategy to improve the photovoltaic performance and stability ofα-FAPbI_(3)perovskite cells.