Jeong Se-Yong, Kim Hui-Seon, Park Nam-Gyu
School of Chemical Engineering and Center for Antibonding Regulated Crystals, Sungkyunkwan University (SKKU), Suwon 16419, Korea.
Department of Chemistry, Inha University, Incheon 22212, Korea.
ACS Appl Mater Interfaces. 2022 Aug 3;14(30):34220-34227. doi: 10.1021/acsami.1c21852. Epub 2022 Jan 25.
Perovskite solar cells (PSCs) have drawn great attention because they have seen a dramatic increase in power conversion efficiency (PCE) over only a decade and reached 25.5% of certified PCE in 2021. The efficiency competitiveness with a low production cost puts up PSCs as a candidate for next-generation photovoltaics, encouraging the stability assessment. Research on PSCs, however, still struggles with the stability issue, particularly at elevated temperature, which is mainly ascribed to the use of spiro-MeOTAD as a hole transport material (HTM). Though many attempts have been made to explore a new HTM to replace spiro-MeOTAD, the improved stability is mostly obtained at the expense of losing efficiency. Likewise, the question of the effectiveness of alternatives for spiro-MeOTAD consistently remains. In this perspective, the morphological stability of spiro-MeOTAD at elevated temperatures is discussed to determine the underlying origins of the thermal stability issue and find feasible strategies to resolve it.
钙钛矿太阳能电池（PSCs）备受关注，因为在短短十年间其功率转换效率（PCE）大幅提高，2021年认证的PCE达到了25.5%。较低的生产成本带来的效率竞争力使PSCs成为下一代光伏技术的候选者，这促使人们对其稳定性进行评估。然而，PSCs的研究仍在稳定性问题上苦苦挣扎，尤其是在高温下，这主要归因于使用螺环-MeOTAD作为空穴传输材料（HTM）。尽管人们已多次尝试探索新型HTM来替代螺环-MeOTAD，但稳定性的提高大多是以牺牲效率为代价的。同样，螺环-MeOTAD替代品的有效性问题一直存在。从这个角度出发，本文讨论了螺环-MeOTAD在高温下的形态稳定性，以确定热稳定性问题的潜在根源，并找到可行的解决策略。
