Formation of n-type MoO3 interlayer from a solution processable aprotic solvent-based molybdenum-peroxide precursor and its application to electron transport bilayer for efficient perovskite solar cells

Min Jeong Ki, Hyong Joon Lee, Jin Kyoung Park, Jin Hyuck Heo, Sang Hyuk Im

Research output: Contribution to journalArticlepeer-review

Abstract

An n-type MoO3 thin film was prepared for the first time with solution processable Mo-peroxo (Molybdenum-peroxide ligand) strategy. An aprotic solvent is chosen as an alternative to conventional protic alcoholic diluents for the Mo-peroxo precursor. The proton-donating nature of protic solvents induces gap states to form hole-selective HxMoO3 films, while the absence of proton donors in aprotic solvents facilitates n-type MoO3 thin films by a solution process. The aprotic diluent-based thin film is identified as a peroxy structure at low temperatures and is successfully converted to n-type MoO3 through the removal of peroxide ligands during thermal annealing. Finally, we implement the n-type MoO3 thin film as an inorganic electron transport bilayer paired with SnO2 for (FAPbI3)0.95(MAPbBr3)0.05 perovskite solar cells. The n-type MoO3 interlayer increases the conductivity of the combined n-type MoO3/SnO2 electron transport bilayer, which improves the charge carrier extraction and transport properties. The prepared perovskite solar cell exhibits enhanced power conversion efficiency (PCE) reaching 23.82 % along with a remarkable open-circuit voltage (VOC) of 1.16 V.

Original languageEnglish
Article number142302
JournalChemical Engineering Journal
Volume462
DOIs
Publication statusPublished - 2023 Apr 15

Bibliographical note

Funding Information:
M.J. Ki and H.J. Lee have equally contributed to this work. This study was supported by the National Research Foundation of Korea (NRF) under the Ministry of Science, ICT & Future Planning (Basic Science Research Program [Grant No. 2021R1A5A6002853], [Grant No. 2022R1A2C3004964], [Grant No. 2022R1C1C2008126], [Grant No. 2022M3H4A1A03074093]) and by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) under the Ministry of Trade, Industry & Energy (MOTIE) [Grant No. 20227410100040].

Publisher Copyright:
© 2023 Elsevier B.V.

Keywords

  • Electron transport layer
  • Homovalent
  • Molybdenum oxide
  • Perovskite solar cell
  • Solution process

ASJC Scopus subject areas

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering

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