posted on 2024-01-04, 19:33authored bySangsu Kim, Chang Min Lee, Syed Hamad Ullah Shah, Myung-Chul Jung, Sang Geul Lee, Chul Hoon Kim, Hyun Jae Lee, Chansun Park, Jung-Yeol Yeom, Seung Yoon Ryu, Hyojung Kim, Hochun Park, Won-Young Jeong, Shinhaeng Cho
This study presents a preliminary investigation of the
application
of MAPbI3 perovskite solar cells (PSCs) as dosimeters for
space and medical purposes. Specifically, it explores the effects
of 6 MeV electron beam exposure on the performance and degradation
mechanisms of PSC devices. The study also employs crystallographic,
optical, and simulation-based analyzes to gain insights into the degradation
process. The findings of this research lay the groundwork for the
development of an advanced radiation detection structure, combining
a scintillator with a photocounting PSC device, as a potential replacement
for existing silicon photomultipliers in the future. The PSC devices
exhibit an initial power conversion efficiency of approximately 14%.
However, under electron fluences ranging from 3 to 21 kGy, a gradual
degradation is observed, characterized by a decline in open-circuit
voltage and short-circuit current. Beyond the 9 kGy threshold, the
device performance deteriorates significantly, with a 52% decrease
compared with the initial performance, which is primarily attributed
to a decrease in the fill factor. Through X-ray diffraction, time-resolved
photoluminescence, and density functional theory simulations, the
research uncovers that continuous electron beam exposure induces the
formation of crystallographic defects and shallow traps, leading to
the gradual deterioration of device performance postirradiation.