Electronic and Optical Modulation of Metal-Doped Hybrid Organic-Inorganic Perovskites Crystals by Post-Treatment Control

Arramel, Aozhen Xie, Xinmao Yin, Chi Sin Tang, Muhammad Haris Mahyuddin, Chathuranga Hettiarachchi, Muhammad Fauzi Sahdan, Kazunari Yoshizawa, Cuong Dang, Muhammad Danang Birowosuto, Andrew Thye Shen Wee, Andrivo Rusydi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Recently, considerable interest in the fields of photovoltaics, light emission, and photodetection absorbers has centered on hybrid organic-inorganic perovskites (HOIPs). Here, we report a combined photoluminescence and high-resolution photoemission study to investigate the defect-site passivation of the B-site methylammonium lead bromide perovskites (B site = In3+, Sr2+, and Li+). A distinctive behavior of the optical response is revealed by means of temperature-dependent time-resolved photoluminescence (TR-PL) measurements. Upon mild argon treatment, the initial thermal quenching rate with respect to the radiative transition rate (Δ0/Δv) ratio and thermal quenching activation energy (ΔEq) of Sr-doped MAPbBr3 is reduced by an order of magnitude. The average charge carrier lifetime (τave) of Sr-doped MAPbBr3 after treatment is significantly improved from 36 to 77 ns, respectively. Moreover, the occupied state of metal-doped MAPbBr3 probed by ultraviolet photoemission spectroscopy (UPS) indicates tunable charge transfer based on rational chemical design. Supported by density functional theory, small band gap changes are observed across Sr-, In-, and Li-doped cases. This work improves our understanding of the photophysics of HOIPs with the possible future aim of improving the stability of emergent perovskite materials by post-treatment control.

Original languageEnglish
Pages (from-to)7500-7511
Number of pages12
JournalACS Applied Energy Materials
Volume3
Issue number8
DOIs
Publication statusPublished - Aug 24 2020

All Science Journal Classification (ASJC) codes

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Electrical and Electronic Engineering
  • Materials Chemistry

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