Unraveling the Molecular Size Effect on Surface Engineering of Perovskite Solar Cells

Jinyao Wang; Yulin Wu; Jing Zhao; Shudi Lu; Jiangying Lu; Jiaqian Sun; Shan Wu; Xiaopeng Zheng; Xu Zheng; Xuan Tang; Mengmeng Ma; Shizhong Yue; Kong Liu; Zhijie Wang; Shengchun Qu

doi:10.1002/smtd.202400043

Unraveling the Molecular Size Effect on Surface Engineering of Perovskite Solar Cells

Small Methods. 2024 Mar 11:e2400043. doi: 10.1002/smtd.202400043. Online ahead of print.

Authors

Jinyao Wang^{1

2}, Yulin Wu^{1

2}, Jing Zhao^{1

2}, Shudi Lu^{1

3}, Jiangying Lu^{1

4}, Jiaqian Sun^{1

2}, Shan Wu^{1

4}, Xiaopeng Zheng², Xu Zheng^{1

2}, Xuan Tang^{1

2}, Mengmeng Ma^{1

2}, Shizhong Yue^{1

2}, Kong Liu^{1

2}, Zhijie Wang^{1

2}, Shengchun Qu^{1

2}

Affiliations

¹ Key Laboratory of Semiconductor Materials Science, Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, P. R. China.
² Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
³ Department of Physics, Hebei Normal University of Science & Technology, Qinhuangdao, 066004, P. R. China.
⁴ School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 53004, P. R. China.

PMID: 38462962
DOI: 10.1002/smtd.202400043

Abstract

Surface engineering in perovskite solar cells, especially for the upper surface of perovskite, is widely studied. However, most of these studies have primarily focused on the interaction between additive functional groups and perovskite point defects, neglecting the influence of other parts of additive molecules. Herein, additives with -NH₃ ⁺ functional group are introduced at the perovskite surface to suppress surface defects. The chain lengths of these additives vary to conduct a detailed investigation into the impact of molecular size. The results indicate that the propane-1,3-diamine dihydroiodide (PDAI₂ ), which possesses the most suitable size, exhibited obvious optimization effects. Whereas the molecules, methylenediamine dihydroiodide (MDAI₂ ) and pentane-1,5-diamine dihydroiodide (PentDAI₂ ) with unsuitable size, lead to a deterioration in device performance. The PDAI₂ -treated devices achieved a certified power conversion efficiency (PCE) of 25.81% and the unencapsulated devices retained over 80% of their initial PCE after 600 h AM1.5 illumination.

Keywords: Fermi level shift; additive molecular size; defect passivation; perovskite solar cells; surface engineering.

Abstract

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