Impact of Different π-Bridges on the Photovoltaic Performance of A-D-D'-D-A Small Molecule-Based Donors

Overview

Journal Molecules

Publisher MDPI

Specialty Biology

Date 2024 Sep 14

PMID 39275079

Authors

Lingjun Yang

Yu Wu

Pachaiyappan Murugan

Peng Liu

Yulong Peng

Zhiyong Qiu

Zaifang Li

Changlin Yu

Shiyong Liu

Affiliations

Soon will be listed here.

Abstract

Three small donor molecule materials (, , ) based on dithiophene [2,3-d:2',3'-d']dithiophene [1,2-b:4,5-b']dithiophene (DTBDT) utilized in this study were synthesized using the Vilsmeier-Haack reaction, traditional Stille coupling, and Knoevenagel condensation. Then, a variety of characterization methods were applied to study the differences in optical properties and photovoltaic devices among the three. By synthesizing using a thiophene π-bridge based on , the blue shift in ultraviolet absorption can be enhanced, the band gap and energy level can be reduced, the open circuit voltage () can be increased to 0.75 V using the : device, and a power conversion efficiency (PCE) of 3% can be achieved. Also, after developing the device using , introduced the alkyl chain of thiophene π-bridge to , which improved the solubility of tiny donor molecules, achieved the maximum short-circuit current ( = 10.59 mA/cm), filling factor (FF = 49.72%), and PCE (4.25%). Thus, a viable option for future design and synthesis of small donor molecule materials is to incorporate thiophene π-bridges into these materials, along with alkyl chains, in order to enhance the device's morphology and charge transfer behavior.

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