Intermediate Phase-Free Process for Methylammonium Lead Iodide Thin Film for High-Efficiency Perovskite Solar Cells,Advanced Science

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Intermediate Phase-Free Process for Methylammonium Lead Iodide Thin Film for High-Efficiency Perovskite Solar Cells
Advanced Science ( IF 14.3 ) Pub Date : 2021-09-17 , DOI: 10.1002/advs.202102492
Yeonghun Yun ₁ , Devthade Vidyasagar ₁ , Minho Lee ₁ , Oh Yeong Gong ₂ , Jina Jung ₁ , Hyun-Suk Jung ₂ , Dong Hoe Kim _{3,

4} , Sangwook Lee ₁

Affiliation

Solvent engineering by Lewis-base solvent and anti-solvent is well known for forming uniform and stable perovskite thin films. The perovskite phase crystallizes from an intermediate Lewis-adduct upon annealing-induced crystallization. Herein, it is explored the effects of trimethyl phosphate (TMP), as a novel aprotic Lewis-base solvent with a low donor number for the perovskite film formation and photovoltaic characteristics of perovskite solar cells (PSCs). As compared to dimethylsulfoxide (DMSO) or dimethylformamide (DMF), the usage of TMP directly crystallizes the perovskite phase, i.e., reduces the intermediate phase to a negligible degree, right after the spin-coating, owing to the high miscibility of TMP with the anti-solvent and weak bonding in the Lewis adduct. Interestingly, the PSCs based on methylammonium lead iodide (MAPbI₃) derived from TMP/DMF-mixed solvent exhibit a higher average power conversion efficiency of 19.68% (the best: 20.02%) with a smaller hysteresis in the current-voltage curve, compared to the PSCs that are fabricated using DMSO/DMF-mixed (19.14%) or DMF-only (18.55%) solvents. The superior photovoltaic properties are attributed to the lower defect density of the TMP/DMF-derived perovskite film. The results indicate that a high-performance PSC can be achieved by combining a weak Lewis base with a well-established solvent engineering process.

中文翻译：

用于高效钙钛矿太阳能电池的甲基铵碘化铅薄膜的中间无相工艺

众所周知，路易斯碱溶剂和反溶剂的溶剂工程可形成均匀稳定的钙钛矿薄膜。在退火诱导结晶过程中，钙钛矿相从中间路易斯加合物中结晶出来。在此，研究了磷酸三甲酯（TMP）作为一种低供体数的新型非质子路易斯碱溶剂对钙钛矿薄膜形成和钙钛矿太阳能电池（PSC）光伏特性的影响。与二甲基亚砜（DMSO）或二甲基甲酰胺（DMF）相比，由于TMP与钙钛矿相的高度混溶性，在旋涂后，使用TMP直接结晶钙钛矿相，即将中间相减少到可以忽略不计的程度。路易斯加合物中的反溶剂和弱键合。有趣的是，相比之下，基于TMP/DMF混合溶剂的甲基碘化铅铵（MAPbI 3 ）的PSC表现出更高的平均功率转换效率，为19.68％（最佳：20.02％），并且电流-电压曲线中的滞后更小_。到使用 DMSO/DMF 混合 (19.14%) 或仅 DMF (18.55%) 溶剂制造的 PSC。优异的光伏性能归因于 TMP/DMF 衍生的钙钛矿薄膜的较低缺陷密度。结果表明，通过将弱路易斯碱与成熟的溶剂工程工艺相结合，可以实现高性能 PSC。

更新日期：2021-11-04

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