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Development of High‐Sensitivity Poly(2,7‐(9,9‐dioctylfluorene)‐ alt ‐5,5‐(4′,7′‐di‐2‐thienylbenzo [c][1,2,5]thiadiazole)) Thin‐Film‐Based Phototransistors by the Ribbon‐Floating Film Transfer Method
Author(s) -
Yadav Nidhi,
Kumari Nikita,
Ando Yoshito,
Pandey Shyam S.,
Singh Vipul
Publication year - 2021
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.202100185
Subject(s) - ribbon , materials science , photosensitivity , fabrication , responsivity , optoelectronics , polymer , thin film , thin film transistor , transistor , nanotechnology , photodetector , composite material , layer (electronics) , electrical engineering , medicine , alternative medicine , engineering , pathology , voltage
Alignment of polymer chains holds the key to the development of highly functional polymer‐based field‐effect transistors (FETs). The recently developed ribbon‐floating film transfer method (ribbon‐FTM) has the potential for development of polymer thin films with highly aligned chains, which are desirable for fabrication of efficient planar devices. These thin films consisting of well‐aligned polymer chains exhibit high degree of optical and electronic anisotropies. Herein, ribbon‐FTM‐processed thin‐film‐based organic photosensitive transistors of poly(2,7‐(9,9‐dioctylfluorene)‐ alt ‐5,5‐(4′,7′‐di‐2‐thienylbenzo [c][1,2,5]thiadiazole)) (PFO‐DBT) are reported. Under optimized fabrication conditions, polymer FETs based on PFO‐DBT demonstrate a charge carrier mobility of 0.002 cm 2 V −1 s −1 and an on–off ratio of 5 × 10 4 under dark conditions. The devices further demonstrate a photosensitivity of ≈10 4 and 10 3 and a high responsivity of 8.37 and 4.6 A W −1 against green and red light illuminations, respectively. The results hold promise for the development of conducting‐polymer‐based high‐performance photosensitive organic field‐effect transistors (OFETs).