Photon Upconverting Solid Films with Improved Efficiency for Endowing Perovskite Solar Cells with Near-Infrared Sensitivity

Mika Kinoshita, Yoichi Sasaki, Shogo Amemori, Naoyuki Harada, Zhanhao Hu, Zonghao Liu, Luis K. Ono, Yabing Qi, Nobuhiro Yanai, Nobuo Kimizuka

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Perovskite solar cells have emerged as the next-generation high-efficiency solar cell, but their absorption is mostly limited to the visible (vis) range. One possible solution is to integrate near-infrared (NIR)-to-vis photon upconversion (UC). Herein, we show the first example of endowing perovskite solar cells with NIR sensitivity by using solid films showing NIR-to-vis UC based on triplet-triplet annihilation (TTA). A high TTA-UC efficiency of 4.1±0.3 % at an excitation intensity of 125 W/cm2 is achieved by sensitizing a rubrene (acceptor) triplet with an osmium (Os) complex donor having singlet-to-triplet (S−T) absorption in the NIR range, and by increasing the fluorescence quantum yield through energy harvesting to a highly fluorescent collector. In particular, our spectroscopic studies indicate that the upconverted acceptor singlet energy is almost selectively transferred to the collector rather than being quenched by the donor. By attaching the TTA-UC film behind a semi-transparent perovskite solar cell, a photocurrent generation is observed under excitation at 938 nm.

Original languageEnglish
Pages (from-to)5271-5278
Number of pages8
JournalChemPhotoChem
Volume4
Issue number11
DOIs
Publication statusPublished - Nov 2020

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Analytical Chemistry

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