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Atmospherically Processed and Stable Cs-Pb Based Perovskite Solar Cells

Published online by Cambridge University Press:  20 June 2017

Shubhra Bansal  and
Michelle Chiu
Shubhra Bansal*
Affiliation:
Department of Mechanical Engineering, Center of Energy Research, University of Nevada Las Vegas, Las Vegas, Nevada 89154, U.S.A.
Michelle Chiu
Affiliation:
Department of Mechanical Engineering, Center of Energy Research, University of Nevada Las Vegas, Las Vegas, Nevada 89154, U.S.A.
*
*(Email: [email protected])

Abstract

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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.

Keywords

CsBrPb
Type
Articles
Information
MRS Advances , Volume 2 , Issue 53: Energy Storage and Conversion , 2017 , pp. 3083 - 3090
Copyright
Copyright © Materials Research Society 2017 

References

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