Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 8, Pages 10231-10238Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c21992
Keywords
photocurrent; perovskite; organic semiconductors; photodetector; recombination; charge transport
Funding
- National Science Foundation (NSF) [ECCS-1608095]
- DMR DMREF [1627925]
- DOE, Office of Science [DESC0014579]
- NSF [CMMI-1824674, DMR-1627453, DMR-1420541, 1849213]
- NSF's MRSEC program
- NSF DMR DMREF [1627428]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1627428] Funding Source: National Science Foundation
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The study shows that by adjusting the microstructure of the electronically active layers at the interface of hybrid organic-inorganic metal-halide perovskites and organic semiconductors, the photocurrent response can be significantly enhanced, leading to improved performance of photodetectors.
Hybrid organic-inorganic metal-halide perovskites have emerged as versatile materials for enabling low-cost, mechanically flexible optoelectronic applications. The progress has been commendable; however, technological breakthroughs have outgrown the basic understanding of processes occurring in bulk and at device interfaces. Here, we investigated the photocurrent at perovskite/organic semiconductor interfaces in relation to the microstructure of electronically active layers. We found that the photocurrent response is significantly enhanced in the bilayer structure as a result of a more efficient dissociation of the photogenerated excitons and trions in the perovskite layer. The increase in the grain size within the organic semiconductor layer results in reduced trapping and further enhances the photocurrent by extending the photocarriers' lifetime. The photodetector responsivity and detectivity have improved by 1 order of magnitude in the optimized samples, reaching values of 6.1 +/- 1.1 A W-1, and 1.5 X 10(11) +/- 4.7 X 10(10) Jones, respectively, and the current-voltage hysteresis has been eliminated. Our results highlight the importance of fine-tuning film microstructure in reducing the loss processes in thin-film optoelectronics based on metal-halide semiconductors and provide a powerful interfacial design method to consistently achieve high-performance photodetectors.
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