Nanoscale control of grain boundary potential barrier, dopant density and filled trap state density for higher efficiency perovskite solar cells

Behzad Bahrami, Sally Mabrouk, Nirmal Adhikari, Hytham Elbohy, Ashim Gurung, Khan M. Reza, Rajesh Pathak, Ashraful H. Chowdhury, Gopalan Saianand, Wenjin Yue, Jiantao Zai, Xuefeng Qian, Mao Liang, Qiquan Qiao

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

In this work, grain boundary (GB) potential barrier (ΔφGB), dopant density (Pnet), and filled trap state density (PGB,trap) were manipulated at the nanoscale by exposing the fabricated perovskite films to various relative humidity (RH) environments. Spatial mapping of surface potential in the perovskite film revealed higher positive potential at GBs than inside the grains. The average ΔφGB, Pnet, and PGB,trap in the perovskite films decreased from 0% RH to 25% RH exposure, but increased when the RH increased to 35% RH and 45% RH. This clearly indicated that perovskite solar cells fabricated at 25% RH led to the lowest average GB potential, smallest dopant density, and least filled trap states density. This is consistent with the highest photovoltaic efficiency of 18.16% at 25% RH among the different relative humidities from 0% to 45% RH. (Figure presented.).

Original languageEnglish (US)
Pages (from-to)409-423
Number of pages15
JournalInfoMat
Volume2
Issue number2
DOIs
StatePublished - Mar 2020
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Materials Science (miscellaneous)

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