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Published on: January 22, 2019
Interfacial engineering via dipolar fullerene derivative for efficient tin halide perovskite indoor photovoltaics
Hongbin Xiao1,2, Enhao Cui1, Junfang Wang1
1Beijing Key Laboratory of Embodied Intelligence Computing, School of Optoelectronics, Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, China.
Abstract:
Modulating hot carrier dynamics is crucial in tin halide perovskite photovoltaics, particularly under indoor illumination with limited photon flux. Herein, a fullerene derivative bearing four piperazine groups (denoted as TPPC) is synthesized to engineer the perovskite/C60 interface. The TPPC molecule exhibits a dipole moment of 1.97 Debye, leading to enhanced adsorption energy on perovskite surface and robust interfacial interaction. The newly formed surface dipole optimizes the interfacial energy level alignment via a cascade gradient, enabling modulation of interfacial hot carrier dynamics. Consequently, TPPC-treated photovoltaic devices achieve a champion power conversion efficiency (PCE) of 22.49% and a maximum output power density (Pout) of 64.1 μW cm-2 under white light-emitting diode illumination (3000 K, 1000 lux, 285 μW cm-2). Large-area (1.21 cm2) devices attain a PCE of 17.94% (certified: 15.93%) and a maximum Pout of 51.2 μW cm-2 under the same illumination conditions.
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