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Solution-processable small molecule based all-organic ultraviolet photodetector
Date Issued
01-10-2021
Author(s)
Dhar, Rajdeep
Ramakrishna, Jagarapu
Nawani, Vinay
Manda, Prashanth Kumar
Gupta, Dhritiman
Indian Institute of Technology, Madras
Indian Institute of Technology, Madras
Abstract
A tetramethoxyfluorene derivative (TMD) based small molecule (C53H54O4) has been used as a donor in a bulk-heterojunction donor-acceptor blend system to realize room temperature solution-processed ultraviolet (UV) photodetector. A systematic opto-electronic study to optimize the weight ratio of the blend of TMD and a common acceptor [6,6]-phenyl-C61 butyric acid methyl ester (PCBM) is presented in this report. The fabricated detector is found to cover the most harmful UVA region while transmitting nearly the entire visible spectrum of light. The responsivity of 6 × 10−2 A/W, specific detectivity of 9.36 × 1011Jones and photosensitivity of 105, which are on par with the existing UV photodetectors reported in the literature, are obtained at the wavelength 394 nm under zero bias condition.
Volume
280