Panchromatic small-molecule organic solar cells based on a pyrrolopyrrole aza-BODIPY with a small energy loss. (February 2023)

• Record Type: Journal Article
• Authors: Feng, Ru; Mori, Tatsuya; Yasuda, Takuma; Furuta, Hiroyuki; Shimizu, Soji
• Is Part Of: Dyes and pigments. Volume 210(2023)
• Publication Date: 2023-02
• Subjects: Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2022.111020
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: A small photon energy loss ( E loss ) is one of the requisites for achieving near-infrared (NIR) small-molecule organic solar cells (SM-OSCs). Herein, we present two novel pyrrolopyrrole aza-BODIPY (PPAB)-based panchromatic chromophores, TT-2PPAB and DFBT-2PPAB, with an acceptor-donor-acceptor configuration for photovoltaic studies. Among them, in combination with [6, 6]-phenyl-C71 butyric acid methyl ester (PC71 BM) acceptor, TT-2PPAB exhibits a moderate power conversion efficiency (PCE) of 3.11% due to an E loss of 0.48 eV, which is smaller than the empirical limit of 0.6 eV. Based on the electrochemistry and theoretical calculations, we revealed that the efficient photovoltaic performance of the TT-2PPAB -based device can be ascribed to the sufficiently deep LUMO level of TT-2PPAB for charge transfer to PC71 BM.