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All-Polymer Solar Cells and Photodetectors with Improved stability Enabled by Terpolymers Containing Antioxidant Side Chains

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Nano-Micro Letters 2023年第9期15卷 190-204页

作者： Chunyang Zhang Ao Song Qiri Huang Yunhao Cao Zuiyi Zhong Youcai Liang Kai Zhang Chunchen Liu Fei Huang Yong Cao Institute of Polymer Optoelectronic Materials and devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou 510640People’s Republic of China

It is of vital importance to improve the long-term and photostability of organic photovoltaics,including organic solar cells(OSCs)and organic photodetectors(OPDs),for their ultimate industrialization.Herein,two series of terpolymers featuring with an antioxidant butylated hydroxytoluene(BHT)-terminated side chain,PTzBI-EHp-BTBHTx and N2200-BTBHTx(x=0.05,0.1,0.2),are designed and synthesized.It was found that incorporating appropriate ratio of benzothiadiazole(BT)with BHT side chains on the conjugated backbone would induce negligible effect on the molecular weight,absorption spectra and energy levels of polymers,however,which would obviously enhance the photostability of these polymers.Consequently,all-polymer solar cells(all-PSCs)and photodetectors were fabricated,and the all-PSC based on PTzBI-EHp-BTBHT0.05:N2200 realized an optimal power conversion efficiency(PCE)approaching~10%,outperforming the device based on pristine PTzBI-EHp:N2200.Impressively,the all-PSCs based on BHT-featuring terpolymers displayed alleviated PCEs degradation under continuous irradiation for 300 h due to the improved morphological and photostability of active layers.The OPDs based on BHT-featuring terpolymers achieved a lower dark current at−0.1 bias,which could be stabilized even after irradiation over 400 h.This study provides a feasible approach to develop terpolymers with antioxidant efficacy for improving the lifetime of OSCs and OPDs.

关键词： Organic photovoltaics device operational stability All-polymer solar cell Organic photodetector Antioxidant

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