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Research Direction toward Theoretical Efficiency in Perovskite Solar Cells
ACS Photonics ( IF 6.5 ) Pub Date : 2018-07-02 00:00:00 , DOI: 10.1021/acsphotonics.8b00124
Nam-Gyu Park 1, 2 , Hiroshi Segawa 2
Affiliation  

The recently certified efficiency of 22.7% makes perovskite solar cells (PSCs) rise to the top among the thin film technologies of photovoltaics. The research activities of PSCs have been triggered by the ground-breaking report on a 9.7% efficient and 500 h-stable solid-state perovskite solar cell employing methylammonium lead iodide adsorbed on mesoporous TiO2 film and an organic hole conducting layer in 2012. However, PSCs are facing issues on stability, current–voltage hysteresis, ion migration, and so on, which should be solved for commercialization. In addition, further improvement in power conversion efficiency is still needed for PSCs. In this Perspective, the Shockley–Queisser (S-Q) limit in PSCs is investigated, where the best performing state-of-the-art PSC is used for this study. Short-circuit photocurrent density (Jsc) is found to approach the S-Q limit, while open-circuit voltage (Voc) and fill factor (FF) are far below their S-Q limits. Thus, toward an S-Q limit efficiency of ∼30% for PSCs with a light absorber having a band gap of 1.6 eV, a strategy of reducing nonradiative recombination and interface recombination to achieve a theoretical Voc and FF is more important than finding a method to improve Jsc. To this end, types of defects should be sophisticatedly characterized and engineered, although organic–inorganic halide perovskites are known to be defect-tolerant and have a benign grain boundary.

中文翻译:

钙钛矿太阳能电池理论效率的研究方向

最近获得认证的22.7%的效率使钙钛矿太阳能电池(PSC)成为光伏薄膜技术中的佼佼者。关于PSC的研究活动是由具有开创性的报告引发的,该报告具有9.7%的效率和500 h稳定的固态钙钛矿太阳能电池,其使用甲基铵碘化铅吸附在中孔TiO 2上薄膜和有机空穴传导层在2012年。但是,PSC面临稳定性,电流-电压滞后,离子迁移等问题,应将其商业化解决。另外,对于PSC,仍然需要进一步提高功率转换效率。在此“观点”中,对PSC中的Shockley-Queisser(SQ)限制进行了研究,在此研究中,使用了性能最佳的最新PSC。发现短路光电流密度(J sc)接近SQ极限,而开路电压(V oc))和填充因子(FF)远远低于其SQ限制。因此,对于带隙为1.6 eV的光吸收剂的PSC,SQ极限效率达到约30%,减少非辐射复合和界面复合以实现理论V oc和FF的策略比找到一种方法更重要。改善J sc。为此,尽管已知有机-无机卤化物钙钛矿具有一定的耐缺陷性,并且具有良性的晶界,但仍应对缺陷的类型进行精确的表征和设计。
更新日期:2018-07-02
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