High-performance organic photodetectors enabled by a refined fibrillar multiphase morphology
Journal Article
·
· Chemical Engineering Journal
- South China University of Technology (SCUT), Guangzhou (China); South China Institute of Collaborative Innovation, Dongguan (China)
- Shanghai Jiao Tong University (China)
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Film morphology of donor:acceptor blend layers plays a critical role in photon-to-current efficiency and dark/noise current of organic photodetectors (OPDs). One effective approach to manipulate crystallization and mesoscale phase separation of such blend layers is sequential casting (SC). However, the guiding strategies to control the morphology and the impacts on OPD performance of the SC films remain elusive, as the film structural evolution during SC is different from conventional blend casting (BC). In this report a refined fibrillar multiphase morphology is demonstrated by SC in an NT812:IEICO-4F blend film, where the high-quality IEICO-4F crystallites infiltrate the robust NT812 fibril network from the surface to the bulk. Such a morphology leads to improved charge generation and collection, reduced trap states, and enhanced charge block capability of resultant device, enabling simultaneous achievement of high external quantum efficiency and low dark/noise current. A maximum special detectivity of 5 × 1013 Jones is achieved at 860 nm under –0.1 V, which is among the highest detectivities for vis-to-NIR OPDs. The linear dynamic range and response speed are also improved. Such enhancements are parallelly observed from OPD devices based on other blend systems with similar fibrillar refinement, which provides guidelines for film structure manipulation towards high OPD performance.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- China Postdoctoral Science Foundation; Dongguan Innovative Research Team Program; National Natural Science Foundation of China; Natural Science Foundation of Guangdong Province; USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 2278643
- Alternate ID(s):
- OSTI ID: 1961494
- Journal Information:
- Chemical Engineering Journal, Journal Name: Chemical Engineering Journal Vol. 452; ISSN 1385-8947
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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