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Effect of excessive Pb on the stability and performance of Pb-halide perovskite solar cells against photo-induced degradation

Published online by Cambridge University Press:  28 December 2018

Aditya S. Yerramilli ,
Yuanqing Chen  and
T. L. Alford Open the ORCID record for T. L. Alford [Opens in a new window]
Aditya S. Yerramilli
Affiliation:
School for Engineering of Matter, Transport and Energy, Arizona State University, AZ, USA
Yuanqing Chen
Affiliation:
School for Engineering of Matter, Transport and Energy, Arizona State University, AZ, USA Department of Materials Physics & Chemistry, Xi'an University of Technology, Xi'an, China
T. L. Alford*
Affiliation:
School for Engineering of Matter, Transport and Energy, Arizona State University, AZ, USA Materials Science Graduate Program, African University of Science and Technology, Abuja, Nigeria
*
Address all correspondence to T. L. Alford at [email protected]
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Abstract

Perovskite solar cells have evolved significantly since their inception. However, stability is still a major concern. We fabricated devices using a glass/ITO/PEDOT:PSS/MAPbI3/PCBM/Ag device configuration. Devices fabricated using the Pb-acetate precursors showed an efficiency of 13%. This work reports the effect of adding excess lead to the precursor and its impact on the light-induced degradation of efficiency. It is found that 5% excess lead is best for devices regarding the performance and stability and devices retained greater than 50% of the initial efficiency after 2 h of prolonged irradiation. We attribute this phenomenon to the formation of PbI2 which induces passivation in the grain-boundaries.

Type
Research Letters
Information
MRS Communications , Volume 9 , Issue 1 , March 2019 , pp. 189 - 193
Copyright
Copyright © Materials Research Society 2018 

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