Designing Nonplanar Electron Acceptors for High-Performance Organic Photodetectors: Mechanism Analysis and Application in Gesture Recognition
Realizing low dark current density (<i>J</i><sub>d</sub>) while maintaining high photoresponse is crucial yet challenging for organic photodetectors (OPDs). In this work, two nonplanar small molecule electron acceptors, BTTPCN-F and BTTPCN-Cl, were developed. The OPDs based on them achieved ultralow <i>J</i><sub>d</sub> down to 2.95 × 10<sup>-13</sup> A cm<sup>-2</sup> and exceptionally high shot noise-limited detectivity (<i>D</i><sub>sh</sub>*) up to 1.12 × 10<sup>15</sup> Jones, which are the lowest <i>J</i><sub>d</sub> and highest <i>D</i><sub>sh</sub>* reported for self-powered OPDs to date. The ultralow <i>J</i><sub>d</sub> is attributed to the high reorganization energy and small intermolecular electronic coupling in these nonplanar molecules. On the other hand, their large molecular dipole moment and high dielectric constant contribute to low exciton binding energy, leading to high photoresponse. Consequently, they can work as effective dark current suppressors for achieving high-performance binary or ternary OPDs. A dynamic gesture recognition system based on BTTPCN-Cl OPD was developed, which can accurately identify the gesture input. This work unveils the great potential of high dielectric constant nonplanar organic semiconductors for photodetection.
Authors
- Yuanpeng Xie (ORCID: https://orcid.org/0000-0001-7861-3171)
- Ke Jin (ORCID: https://orcid.org/0000-0001-7697-0466)
- Jiajia Shao (ORCID: https://orcid.org/0000-0002-9777-1930)
- Zuo Xiao (ORCID: https://orcid.org/0000-0003-3705-7716)
- Zirui Wang
- Yehao Deng (ORCID: https://orcid.org/0000-0002-4119-7132)
- Xiangnan Sun (ORCID: https://orcid.org/0000-0002-5461-9699)
- Liming Ding (ORCID: https://orcid.org/0000-0001-6437-9150)
- Chuantian Zuo (ORCID: https://orcid.org/0000-0003-4327-0855)
- Ruihao Chen (ORCID: https://orcid.org/0000-0001-8425-1234)
- Guangan Nie
- Lingyun Zhu (ORCID: https://orcid.org/0000-0001-7391-1866)
- Tai An (ORCID: https://orcid.org/0000-0002-9220-2560)
- Junqiao Ding (ORCID: https://orcid.org/0000-0001-7719-6599)
- Yong Ding (ORCID: https://orcid.org/0000-0002-4921-0979)
- Xiyan Pan
- Zhenxing Wang (ORCID: https://orcid.org/0000-0002-9882-4774)
- Jingjing Chang (ORCID: https://orcid.org/0000-0003-3773-182X)
- Xianyi Meng
- Miaoqiang Lv (ORCID: https://orcid.org/0009-0000-1512-774X)
Institutions
- Guangdong University of Technology (CN)
- Xidian University (CN)
- Chongqing University (CN)
- Hohai University (CN)
- Northwestern Polytechnical University (CN)
- Guizhou University (CN)
- Yunnan University (CN)
- Center for NanoScience (DE)
- Quantum Devices (United States) (US)
- Beijing Institute of Nanoenergy and Nanosystems (CN)
- National Center for Nanoscience and Technology (CN)
- University of Chinese Academy of Sciences (CN)
Publication Details
- Journal
- ACS Nano
- Published
- 2025-08-04
- DOI
- https://doi.org/10.1021/acsnano.5c05794
- Citations
- 1
- Primary Topic
- Conducting polymers and applications
- Type
- article
- Field-Weighted Citation Impact
- 0.61
Funders
- National Natural Science Foundation of China
- Chinese Academy of Sciences
- Beijing Municipal Natural Science Foundation
- National Key Research and Development Program of China