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Issue 5, 2020
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A novel wide-bandgap small molecule donor for high efficiency all-small-molecule organic solar cells with small non-radiative energy losses

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Abstract

In this work, a wide-bandgap small molecule donor, BTTzR, that incorporates the electron-donating alkylthienyl-substituted benzo[1,2-b:4,5-b']dithiophene (BDT-T) unit and the electron-deficient thiazolo[5,4-d]thiazole (TTz) unit as the building block units is designed and synthesized. BTTzR exhibits strong absorption in the wavelength range of 400–650 nm with a wide optical bandgap of 1.88 eV, a low-lying highest occupied molecular orbital (HOMO) energy level of –5.58 eV, and an ordered molecular orientation and packing. Hence, optimized all-small-molecule organic solar cells (SM-OSCs) based on BTTzR as a donor and Y6 as an acceptor achieve an outstanding power conversion efficiency (PCE) of 13.9%, which is among the highest values reported in the literature to date. More importantly, the devices exhibit a very small non-radiative energy loss of 0.18 eV, which is similar to those of inorganic solar cells. These results indicate that BTTzR is a promising small molecule donor material for SM-OSC application and provide new insight into the design of photovoltaic materials to reduce the non-radiative energy loss in the OSCs.

Graphical abstract: A novel wide-bandgap small molecule donor for high efficiency all-small-molecule organic solar cells with small non-radiative energy losses

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Supplementary files

Article information


Submitted
30 Dec 2019
Accepted
30 Mar 2020
First published
02 Apr 2020

Energy Environ. Sci., 2020,13, 1309-1317
Article type
Communication

A novel wide-bandgap small molecule donor for high efficiency all-small-molecule organic solar cells with small non-radiative energy losses

Y. Wang, Y. Wang, L. Zhu, H. Liu, J. Fang, X. Guo, F. Liu, Z. Tang, M. Zhang and Y. Li, Energy Environ. Sci., 2020, 13, 1309
DOI: 10.1039/C9EE04199K

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