Formation of a Fast Charge Transfer Channel in Quasi-2D Perovskite Solar Cells through External Electric Field Modulation

Xixiang Zhu, Liping Peng, Jinpeng Li, Haomiao Yu and Yulin Xie
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Xixiang Zhu: Key Laboratory of Luminescence and Optical Information, Department of Physics, School of Science, Beijing Jiaotong University, Ministry of Education, Beijing 100044, China
Liping Peng: School of Physics and Electronics, Huanggang Normal University, Huanggang 438000, China
Jinpeng Li: Key Laboratory of Luminescence and Optical Information, Department of Physics, School of Science, Beijing Jiaotong University, Ministry of Education, Beijing 100044, China
Haomiao Yu: Key Laboratory of Luminescence and Optical Information, Department of Physics, School of Science, Beijing Jiaotong University, Ministry of Education, Beijing 100044, China
Yulin Xie: School of Physics and Electronics, Huanggang Normal University, Huanggang 438000, China

Energies, 2021, vol. 14, issue 21, 1-10

Abstract: Quasi-2D perovskites solar cells exhibit excellent environmental stability, but relatively low photovoltaic properties, compared with 3D perovskites solar cells. However, charge transport and extraction in quasi-2D perovskite solar cells are still limited by the inevitable quantum well effect, resulting in low power conversion efficiency (PCE). To date, most efforts concentrate on crystal orientation and favorable alignment during materials and films processing. In this paper, we demonstrated that the quasi-2D perovskite [(BA) 2 (MA) 3 Pb 4 I 13 ( n = 4)] solar cells show an optimized device performance through forming a fast charge transfer channel among 2D quantum wells through external electric field modulation, with appropriate modulation bias and time after the device has been fabricated. Essentially, ions will move directionally due to local polarization in quasi-2D perovskite solar cells under the action of electric field modulation. More importantly, the mobile ions function as a dopant to de-passivate the defects when releasing at grain boundaries, while decreasing built-in potential by applying forward modulation bias with proper modulation time. The capacitance-voltage characteristics indicate that electric field modulation can decrease the charge accumulation and improve the charge collection in quasi-2D perovskite solar cells. Photoluminescence (PL) studies confirm that the non-radiative recombination is reduced by electric field modulation, leading to enhanced charge transfer. Our work indicates that external electric field modulation is an effective method to form a fast charge transfer channel among 2D quantum wells, leading to enhanced charge transfer and charge collection through local polarization toward developing high–performance quasi-2D perovskite devices.

Keywords: quasi-2D perovskite; ions; electric field modulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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