@article{83fd34de23ff49249c93c6c5ea5501f6,
title = "Photon Upconverting Solid Films with Improved Efficiency for Endowing Perovskite Solar Cells with Near-Infrared Sensitivity",
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.",
author = "Mika Kinoshita and Yoichi Sasaki and Shogo Amemori and Naoyuki Harada and Zhanhao Hu and Zonghao Liu and Ono, {Luis K.} and Yabing Qi and Nobuhiro Yanai and Nobuo Kimizuka",
note = "Funding Information: This work was partly supported by JSPS KAKENHI grant number JP20H02713, JP17H04799, JP16H06513, the Yoshida Foundation for the Promotion of Learning and Education, the Sumitomo Foundation, the Ogasawara Foundation, and the “Innovation inspired by Nature” Research Support Program, Sekisui Chemical Co. Ltd. The work performed at OIST was supported by funding from the Energy Materials and Surface Sciences Unit of the Okinawa Institute of Science and Technology Graduate University, the OIST R&D Cluster Research Program, the OIST Proof of Concept (POC) Program, and JSPS KAKENHI Grant Number JP18K05266. Funding Information: This work was partly supported by JSPS KAKENHI grant number JP20H02713, JP17H04799, JP16H06513, the Yoshida Foundation for the Promotion of Learning and Education, the Sumitomo Foundation, the Ogasawara Foundation, and the ?Innovation inspired by Nature? Research Support Program, Sekisui Chemical Co. Ltd. The work performed at OIST was supported by funding from the Energy Materials and Surface Sciences Unit of the Okinawa Institute of Science and Technology Graduate University, the OIST R&D Cluster Research Program, the OIST Proof of Concept (POC) Program, and JSPS KAKENHI Grant Number JP18K05266. Publisher Copyright: {\textcopyright} 2020 Wiley-VCH GmbH Copyright: Copyright 2020 Elsevier B.V., All rights reserved.",
year = "2020",
month = nov,
doi = "10.1002/cptc.202000143",
language = "English",
volume = "4",
pages = "5271--5278",
journal = "ChemPhotoChem",
issn = "2367-0932",
publisher = "Wiley-VCH Verlag",
number = "11",
}