(3-Aminopropyl)trimethoxysilane Surface Passivation Improves Perovskite Solar Cell Performance by Reducing Surface Recombination Velocity

Yangwei Shi; Esteban Rojas-Gatjens; Jian Wang; Justin Pothoof; Rajiv Giridharagopal; Kevin Ho; Fangyuan Jiang; Margherita Taddei; Zhaoqing Yang; Carlos Silva-Acuña; David S. Ginger

arXiv · 2209.15105

(3-Aminopropyl)trimethoxysilane Surface Passivation Improves Perovskite Solar Cell Performance by Reducing Surface Recombination Velocity

Yangwei Shi·Esteban Rojas-Gatjens·Jian Wang·Justin Pothoof·Rajiv Giridharagopal·Kevin Ho·Fangyuan Jiang·Margherita Taddei·Zhaoqing Yang·Carlos Silva-Acuña·David S. Ginger

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Abstract

We demonstrate reduced surface recombination velocity (SRV) and enhanced power-conversion efficiency (PCE) in mixed-cation mixed-halide perovskite solar cells by using (3-aminopropyl)trimethoxysilane (APTMS) as a surface passivator. We show the APTMS serves to passivate defects at the perovskite surface, while also decoupling the perovskite from detrimental interactions at the C60 interface. We measure a SRV of ~125 + 14 cm/s, and a concomitant increase of ~100 meV in quasi-Fermi level splitting in passivated devices compared to the controls. We use time-resolved photoluminescence and excitation-correlation photoluminescence spectroscopy to show that APTMS passivation effectively suppresses non-radiative recombination. We show that APTMS improves both the fill factor and open-circuit voltage (VOC), increasing VOC from 1.03 V for control devices to 1.09 V for APTMS-passivated devices, which leads to PCE increasing from 15.90% to 18.03%. We attribute enhanced performance to reduced defect density or suppressed nonradiative recombination and low SRV at the perovskite/transporting layers interface.

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Yangwei Shi, Esteban Rojas-Gatjens, Jian Wang, Justin Pothoof, Rajiv Giridharagopal, Kevin Ho, Fangyuan Jiang, Margherita Taddei, Zhaoqing Yang, Carlos Silva-Acuña, David S. Ginger. 2022-09-29. (3-Aminopropyl)trimethoxysilane Surface Passivation Improves Perovskite Solar Cell Performance by Reducing Surface Recombination Velocity. https://arxiv.org/abs/2209.15105

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