Abstract
Photomultiplication-type polymer photodetectors (PM-PPDs) were achieved with polymer P3HT as donor and PY3Se-1V as acceptor based on structure of ITO/PEDOT:PSS/active layer/Al. The optimal weight ratio of P3HT to PY3Se-1V is about 100:3. Amounts of isolated electron traps are formed with PY3Se-1V surrounded by P3HT due to rather less content of PY3Se-1V in active layers and about 0.94 eV energy offset between the lowest unoccupied molecular orbitals (LUMO) of P3HT and PY3Se-1V. The optimal PM-PPDs exhibit broad spectral response from 350 to 950 nm and external quantum efficiency (EQE) values of 68,200% at 360 nm, 26,400% at 630 nm and 19,500% at 850 nm under −15 V bias. The working mechanism of PM-PPDs is attributed to the interfacial trap-assisted hole tunneling injection from external circuit. The performance of PM-PPDs can be further improved by incorporating appropriate PMBBDT with high hole mobility as the third component. The EQE values of optimal ternary PM-PPDs are increased to 105,000% at 360 nm, 40,000% at 630 nm and 31,800% at 850 nm under −15 V bias, benefiting from the enhanced hole transport in ternary active layers. The optimal ternary PM-PPDs were successfully applied in a light-controlled circuit to turn on or turn off light emitting diode (LED).
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Acknowledgements
This work was supported by the Fundamental Research Funds for the Central Universities (2021YJS176), the National Natural Science Foundation of China (61975006, 62075155, 62175011), the Postdoctoral Innovative Talent Support Program (BX20200042) and the China Postdoctoral Science Foundation (2020M680327).
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Liu, M., Fan, Q., Yang, K. et al. Broadband photomultiplication-type polymer photodetectors and its application in light-controlled circuit. Sci. China Chem. 65, 1642–1649 (2022). https://doi.org/10.1007/s11426-022-1296-2
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DOI: https://doi.org/10.1007/s11426-022-1296-2