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

研究成果: ジャーナルへの寄稿学術誌査読

5 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)7500-7511
ページ数12
ジャーナルACS Applied Energy Materials
3
8
DOI
出版ステータス出版済み - 8月 24 2020

!!!All Science Journal Classification (ASJC) codes

  • 化学工学(その他)
  • エネルギー工学および電力技術
  • 電気化学
  • 電子工学および電気工学
  • 材料化学

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