Hysteresis Effects in Photovoltaic Devices Based on a Two-Dimensional Molecular Ferroelectric

• Published in: ACS applied electronic materials Vol. 6; no. 10; pp. 7402 - 7408
• Main Authors: Yao, Qifu, Li, Qishuo, Jiang, Shaojie, Yang, Jianping, Mao, Weiwei, Li, Xing’ao
• Format: Journal Article
• Language: English
• Published: American Chemical Society 22.10.2024
• Subjects: polarization; perovskite; molecular ferroelectric; two-dimensional; photovoltaic
• ISSN: 2637-6113; 2637-6113
• DOI: 10.1021/acsaelm.4c01295

Narrow bandgap two-dimensional molecular ferroelectric materials have enormous potential in the field of optoelectronics, but excellent species are still scarce. (4-Iodobutylammonium)2­(methylammonium)2­Pb3I10 (IBMPI) has been demonstrated to be a low-bandgap two-dimensional biaxial mixed perovskite molecular ferroelectric. In this work, we used IBMPI as the light-absorbing layer to fabricate p-i-n structured photovoltaic devices. Under the irradiation of AM 1.5 G, the IBMPI-based solar devices exhibit significant photovoltaic effects (V OC ≈ 0.78 V, J SC ≈ 5.07 mA/cm2). In addition, by adjustment of the bias history, the intrinsic ferroelectric polarization and ion migration in IBMPI can also be used to adjust photovoltaic performance, especially the open-circuit voltage and fill factor. This work indicates that this two-dimensional molecular ferroelectric is a potential candidate material for preparing tunable photovoltaic devices.