In-Operando Characterization of P-I-N Perovskite Solar Cell Under Reverse Bias

Isaac Gould, Chuanxiao Xiao, Jay Patel, Michael McGehee

Research output: Contribution to conferencePaper

6 Scopus Citations

Abstract

A solar module is often exposed to a variety of intensity and uniformity illumination conditions throughout a day. In the field, objects or dirt can block light from hitting the module creating a partial shading event. When a partial shading event occurs the module power point tracking system will typically push the shaded cells into reverse bias in order to avoid the current loss from the other series connected illuminated cells. When perovskite solar cells are operated in reverse bias, electrochemical reactions can occur, leading to both reversible and irreversible performance losses. Excess holes generated by reverse bias cause and push the oxidation reaction of halide ions from the lattice to neutral halogen interstitial. Small interstitial halogen atoms can diffuse across the device and potentially move from the perovskite layer and into the transport layers, shifting the fermi levels in the devices. In this investigation we utilize cross-sectional kelvin probe atomic force microscopy to map the band energetics of perovskite solar cells during reverse bias. We observe a 150 meV decrease in the work function of the C 60 . This leads to a decrease of 150 mV and 4 mA/cm 2 in V oc and in J sc respectively. Finally, we discuss methods to prevent this irreversible degradation after a perovskite device is held under reverse bias.
Original languageAmerican English
Pages1365-1367
Number of pages3
DOIs
StatePublished - 2021
Event2021 IEEE 48th Photovoltaic Specialists Conference (PVSC) -
Duration: 20 Jun 202125 Jun 2021

Conference

Conference2021 IEEE 48th Photovoltaic Specialists Conference (PVSC)
Period20/06/2125/06/21

NREL Publication Number

  • NREL/CP-5K00-80419

Keywords

  • fullerene
  • KPFM
  • perovskite
  • reverse bias
  • stability

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