Affiliation:
1. College of Materials Science and Opto‐Electronic Technology & Center of Materials Science and Optoelectronics Engineering & CAS Center for Excellence in Topological Quantum Computation & CAS Key Laboratory of Vacuum Physic University of Chinese Academy of Sciences Beijing 100049 China
2. Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China
3. Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 China
4. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Center for Advanced Low‐dimension Materials College of Materials Science and Engineering Donghua University Shanghai 201620 China
Abstract
AbstractHigh‐performance IR organic photodetectors (OPDs) are of great significance for wireless optical communication, light detection and ranging (LiDAR) technology, and wearable electronics. However, high dark current and low responsivity (R) hinder their future commercial application. Herein, fullerene and non‐fullerene acceptors‐based OPDs are fabricated to understand the relationship between the trap density and photo‐responsivity. Impressively, the non‐fullerene system (Poly([2,6′‐4,8‐di(5‐ethylhexylthienyl)benzo[1,2‐b;3,3‐b]dithiophene]{3‐fluoro‐2[(2‐ethylhexyl)carbonyl]thieno[3,4‐b]thiophenediyl}) (PCE10):BTPV‐4F‐eC9) based OPDs exhibits a record R‐value of 0.56 A W−1 at 900 nm in no gain photodiode‐type OPDs, which results in a high detectivity over 1013 Jones in 400–1030 nm at room temperature. Mechanistic studies show that the low trap density plays critical role in reducing the trap‐assisted recombination and density of thermally generated carriers, thus improving the responsivity and reducing the dark current of the device. These findings provide new insights into the mechanism of high‐performance self‐powered near‐infrared OPDs.
Funder
National Natural Science Foundation of China
Subject
Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials
Cited by
20 articles.
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