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Oxygen vacancies modulating self-powered photoresponse in PEDOT:PSS/ε-Ga2O3heterojunction by trapping effect
- Source :
- SCIENCE CHINA Technological Sciences; March 2022, Vol. 65 Issue: 3 p704-712, 9p
- Publication Year :
- 2022
-
Abstract
- Can the modulation effect of charge-carrier transfer be inherited from a single layer to its heterojunction structure? Certainly, the answer is yes. Herein, we experimentally verify that the photodetection performance modulation effect of oxygen vacancy (Vo) is transmitted from the ε-Ga2O3layer to the PEDOT:PSS/ε-Ga2O3(PGO) hybrid heterojunction. By adopting the annealed ε-Ga2O3films, whose Voconcentrations are remolded by annealing ambients, the constructed PGO photodetectors (PDs) demonstrate regulable self-powered performance. As the Vodefects decrease, the photodetection properties are effectively enhanced with a high photo-to-dark current ratio of 2.37×107, an excellent on/off switching ratio of 6.45×105, fast rise/decay time of 121/72 ms, a large responsivity of 67.9 mA/W, superior detectivity of 9.2×1013Jones, an outstanding external quantum efficiency of 33.2%, and a high rejection ratio (R250/R400) of 5.96×106at 0 V in PGO-O2PD. The better photoresponse is attributed to the less Vodefect concentration in the ε-Ga2O3layer, which could favor the lower electron-trapping probability and a more efficient charge-carrier transfer. Considering the universality of Vodefects in oxide materials, the proposed regulation strategy of photoresponse will open the route of high self-powered performance for next-generation ultraviolet PDs.
Details
- Language :
- English
- ISSN :
- 16747321 and 18691900
- Volume :
- 65
- Issue :
- 3
- Database :
- Supplemental Index
- Journal :
- SCIENCE CHINA Technological Sciences
- Publication Type :
- Periodical
- Accession number :
- ejs58861606
- Full Text :
- https://doi.org/10.1007/s11431-021-1945-x