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High‐Performance Phototransistors Based on Single‐Crystalline n‐Channel Organic Nanowires and Photogenerated Charge‐Carrier Behaviors
Abstract
The photoelectronic characteristics of single‐crystalline nanowire organic phototransistors (NW‐OPTs) are studied using a high‐performance n‐channel organic semiconductor, N,N′‐bis(2‐phenylethyl)‐perylene‐3,4:9,10‐tetracarboxylic diimide (BPE‐PTCDI), as the photoactive layer. The optoelectronic performances of the NW‐OPTs are analyzed by way of their current–voltage (I–V) characteristics on irradiation at different wavelengths, and comparison with corresponding thin‐film organic phototransistors (OPTs). Significant enhancement in the charge‐carrier mobility of NW‐OPTs is observed upon light irradiation as compared with when performed in the dark. A mobility enhancement is observed when the incident optical power density increases and the wavelength of the light source matches the light‐absorption range of the photoactive material. The photoswitching ratio is strongly dependent upon the incident optical power density, whereas the photoresponsivity is more dependent on matching the light‐source wavelength with the maximum absorption range of the photoactive material. BPE‐PTCDI NW‐OPTs exhibit much higher external quantum efficiency (EQE) values (≈7900 times larger) than thin‐film OPTs, with a maximum EQE of 263 000%. This is attributed to the intrinsically defect‐free single‐crystalline nature of the BPE‐PTCDI NWs. In addition, an approach is devised to analyze the charge‐transport behaviors using charge accumulation/release rates from deep traps under on/off switching of external light sources.
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Physics of Semiconductor Devices
Sze, S. M., & Ng, K. K. (2006) · doi:10.1002/0470068329 · Cited by 14,627
Odian, G. (2004) · doi:10.1002/047147875x · Cited by 7,158
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Gong, Z.-L., Zhu, X., Zhou, Z., Zhang, S.-W., Yang, D., Zhao, B., Zhang, Y.-P., Deng, J., Cheng, Y., Zheng, Y.-X., et al. (2021) · Science China Chemistry · doi:10.1007/s11426-021-1146-6 · Cited by 608
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Metadata
- Authors
- Yu, H., Bao, Z., & Oh, J. H.
- Venue
- Advanced Functional Materials
- Publisher
- Wiley
- Published
- 2012-09-07
- Volume
- 23
- Issue
- 5
- Pages
- 629-639
- ISSN
- 1616-301X (ISSN-L)
- 1616-3028
- OpenAlex
- W2141298764
- Cited by
- 206
- References
- 2
- FWCI
- 9.36
- Type
- journal article
- Language
- en
- Open access
- closed
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