Issue 14, 2023

A nonfullerene acceptor with π-conjugation extended end groups to achieve enhanced photovoltaic performance

Abstract

An acceptor–donor–acceptor (A–D–A) type nonfullerene acceptor (NFA), namely TTNC, was designed and synthesized using a π-conjugation extension strategy on the terminal unit based on one successful NFA material TTIC. Benefiting from the end-extended conjugation, the new molecule shows red-shifted absorption, more ordered packing, and maintained energy levels compared with TTIC. These advantages contribute to achieving favorable phase separation morphology and strong light-harvesting ability for the donor/acceptor blend film. By combining with a wide band-gap polymer donor PBDB-T, the optimized TTNC based devices exhibit a high power conversion efficiency (PCE) of 11.34%, mainly originating from an enhanced short-current density (Jsc) of 20.95 mA cm−2, especially an excellent fill factor (FF) of 71% which is obviously superior to that of TTIC (66%). The findings indicate that π-conjugation extension is an effective way to manipulate the absorption range, molecular packing and charge mobility of NFAs for an outstanding photovoltaic performance, which offers valuable insight for designing high-efficiency organic solar cells.

Graphical abstract: A nonfullerene acceptor with π-conjugation extended end groups to achieve enhanced photovoltaic performance

Supplementary files

Article information

Article type
Paper
Submitted
18 Jan 2023
Accepted
17 Feb 2023
First published
20 Feb 2023

New J. Chem., 2023,47, 6577-6582

A nonfullerene acceptor with π-conjugation extended end groups to achieve enhanced photovoltaic performance

C. Liu, Z. Wu, N. Qiu, C. Li and Y. Lu, New J. Chem., 2023, 47, 6577 DOI: 10.1039/D3NJ00283G

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