近日，新加坡国立大学的Yi Hou及其研究团队取得一项新进展。经过不懈努力，他们利用自组装分子调节相均匀性提高倒置钙钛矿太阳能电池的效率和稳定性。相关研究成果已于2024年9月18日在国际知名学术期刊《自然—光子学》上发表。
本研究发现，自组装分子（SAMs）的非晶相能够实现更加均匀的钙钛矿生长。高光谱分析证实，在钙钛矿/非晶SAMs中，光致发光峰分布变得更窄且发生了蓝移。此外，依赖于光通量的时间分辨光致发光揭示，基于非晶SAMs的钙钛矿薄膜中陷阱辅助的复合速率降低至0.5×106s-1。
这一改进使得p–i–n结构的钙钛矿太阳能电池，在一平方厘米的区域内实现了25.20%的效率（经认证为24.35%）。根据ISOS-L-1协议，这些电池在600小时的1个太阳最大功率点跟踪测试后，效率几乎保持不变；而根据ISOS-T-2协议评估，在1000小时后，它们仍保留了90%的初始效率。
据悉，钙钛矿及传输界面中存在的异质性问题，对从小规模到大规模提高钙钛矿太阳能电池的效率构成了重大挑战，这是其商业应用的关键障碍。
附：英文原文
Title: Regulating phase homogeneity by self-assembled molecules for enhanced efficiency and stability of inverted perovskite solar cells
Author: Wang, Xi, Li, Jia, Guo, Renjun, Yin, Xinxing, Luo, Ran, Guo, Dengyang, Ji, Kangyu, Dai, Linjie, Liang, Haoming, Jia, Xiangkun, Chen, Jinxi, Jia, Zhenrong, Shi, Zhuojie, Liu, Shunchang, Wang, Yuduan, Zhou, Qilin, Wang, Tao, Pan, Guangjiu, Mller-Buschbaum, Peter, Stranks, Samuel D., Hou, Yi
Issue&Volume: 2024-09-18
Abstract: Heterogeneity in transporting interfaces and perovskites poses a substantial challenge in improving the efficiency of perovskite solar cells from small to large scales, a key barrier to their commercial use. Here we find that the amorphous phases of self-assembling molecules (SAMs) can realize a more homogeneous perovskite growth. Hyperspectral analysis confirms a narrower and blueshifted photoluminescence peak distribution in perovskite/amorphous SAMs. Additionally, fluence-dependent time-resolved photoluminescence reveals a reduced trap-assisted recombination rate of 0.5×106s-1 in amorphous-SAM-based perovskite films. This improvement translates to p–i–n structured perovskite solar cells achieving an efficiency of 25.20% (certified at 24.35%) over a one-square-centimetre area. These cells maintain nearly 100% efficiency after 600h of 1-sun maximum power point tracking under the ISOS-L-1 protocol, and retain 90% of their initial efficiency after 1,000h, as evaluated by the ISOS-T-2 protocol.
DOI: 10.1038/s41566-024-01531-x
Source: https://www.nature.com/articles/s41566-024-01531-x