光电子学
电子受体
有机太阳能电池
响应度
光化学
化学
光电探测器
紫外线
近红外光谱
吸收(声学)
接受者
材料科学
电子供体
光学
有机化学
物理
催化作用
复合材料
聚合物
凝聚态物理
作者
Yongjie Chen,Yingqi Zheng,Yuanyuan Jiang,Haijun Fan,Xiaozhang Zhu
摘要
The emerging donor–acceptor–donor (A-D-A)-type nonfullerene acceptors (NFAs) featuring near-infrared (NIR) photoresponsivity have greatly boosted the development of organic photovoltaics (OPVs) and display great potential for sensitive NIR organic photodetectors (OPDs). However, NIR NFAs with absorption above 1000 nm, which is of great importance for application in NIR OPDs for bioimaging, remote communication, night surveillance, etc., are still rare due to the scarcity of strong electron-rich cores. We report herein a new dithiophene building block, namely PDT, which exhibits the strongest electron-donating ability among the widely used dithiophene building blocks. By applying PDT and PDTT as the electron-donating cores and DFIC as the electron-accepting terminals, we developed two new NIR electron acceptors, PDTIC-4F and PDTTIC-4F, with optical absorptions up to 1030 nm, surpassing that of the well-known O6T-4F acceptor. In comparison with the carbon–oxygen-bridged core COi8 in O6T-4F, the synthetic complexity of PDT and PDTT is significantly reduced. Conventional OPV devices based on PM6:PDTTIC-4F display power conversion efficiencies (PCEs) of up to 10.70% with a broad external quantum efficiency (EQE) response from the ultraviolet–visible to the infrared, leading to a high short-circuit current density (Jsc) of 25.90 mA cm–2. Encouraged by these results, we investigated inverted PM6:PDTTIC-4F-based OPD devices by suppressing the dark current via modulation of the film thickness. The optimal OPD device exhibits compelling performance metrics that can compete with those of commercial silicon photodiodes: a record responsivity of 0.55 A W–1 (900 nm) among photodiode-type OPDs and excellent shot-noise-limited specific detectivity (Dsh*) of over 1013 jones.
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