期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 12, 页码 10202-10210出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b00121
关键词
PCBM; ambipolar transport; phototransistor; UV photodetector; fullerenes
资金
- King Abdullah University of Science and Technology (KAUST)
Combining high charge carrier mobility with ambipolar transport in light-absorbing organic semiconductors is highly desirable as it leads to enhanced charge photogeneration, and hence improved performance, in various optoelectronic devices including solar cells and photo detectors. Here we report the development of [6,6]-phenyl-C-61-butyric acid methyl ester (PC61BM)-based ultraviolet (UV) phototransistors with balanced electron and hole transport characteristics. The latter is achieved by fine-tuning the source drain electrode work function using a self-assembled monolayer. Opto/electrical characterization of as-prepared ambipolar PC61BM phototransistors reveals promising photoresponse, particularly in the UV-A region (315-400 nm), with a maximum photosensitivity and responsivity of 9 x 10(3) and 3 x 10(3) A/W, respectively. Finally, the temporal response of the PC61BM phototransistors is found to be high despite the long channel length (10 s of mu m) with typical switching times of <2 ms.
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