Publication date: 31st May 2020
Low molecular weight materials have been intensively investigated in organic solar cells and field-effect transistors within the last decade [1]. In present work, we report the synthesis of novel low molecular weight photoactive semiconductor material TBTBT comprising electron-deficient benzothiadiazole units (B) and electron-rich thiophene rings (T). This material showed excellent ambient stability and resistance to the light-induced photooxidation, which features it as a promising material for air-stable electronics. TBTBT demonstrated ambipolar semiconductor behavior when investigated in OFETs with charge carrier mobility of ∼4×10-4 cm2V-1s-1.
TBTBT was also explored as electron donor material in organic solar cells in combination with [60]fullerene as an acceptor counterpart. Optimization of the device structure and active layer processing conditions delivered modest power conversion efficiency of 2.5%.
The application of TBTBT as electron transport material in p-i-n perovskite solar cells delivered competitive power conversion efficiency and device operation stability.
This work was supported by the Russian Foundation for Basic Research (grant No. 20-03-00309).
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