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Atmospherically Processed and Stable Cs-Pb Based Perovskite Solar Cells

MRS Advances volume 2, pages 3083–3090 (2017)Cite this article

Abstract

In this work, a planar heterojunction superstrate n-i-p device based on Zn(O,S) electron transport layer and CsPbI2Br absorber material at 1.93 eV bandgap is presented. The CsPbI2Br films are deposited using a 2-step atmospheric solution deposition process and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-vis spectroscopy and photoluminescence (PL). Best device with an efficiency of 12.34 % and 11.94% in reverse and forward scans respectively and stabilized power output of 12.14 mW/cm2 has been demonstrated via atmospheric solution processing with minimal hysteresis between forward and reverse scans. The devices show voltage dependent current collection as well as light-dark crossover in forward bias. Light soaking tests at 65 °C and 1-sun at Voc, resulted in open-circuit voltage and fill-factor degradation. Electroluminescence (EL) after 100 hours of light soaking shows a reduction in overall EL intensity as well a shift in emission to lower wavelength. The devices exhibit a positive temperature coefficient of about 0.14 %/°C. It is found that Zn(O,S) is a viable alternative electron transport layer to replace TiO2. By replacing methylammonium cation with cesium and addition of Br has improved the stability of the perovskite phase.

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  1. Department of Mechanical Engineering, Center of Energy Research, University of Nevada Las Vegas, Las Vegas, Nevada, 89154, USA

    Shubhra Bansal & Michelle Chiu

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  1. Shubhra Bansal
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  2. Michelle Chiu
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Bansal, S., Chiu, M. Atmospherically Processed and Stable Cs-Pb Based Perovskite Solar Cells. MRS Advances 2, 3083–3090 (2017). https://doi.org/10.1557/adv.2017.449

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