Metal Halide Perovskite and Phosphorus Doped g-C3N4 Bulk Heterojunctions for Air-Stable Photodetectors
El Demellawi, Jehad K.
El-Zohry, Ahmed M.
Mohammed, Omar F.
Alshareef, Husam N.
KAUST DepartmentChemical Science Program
Functional Nanomaterials Lab (FuNL)
Functional Nanomaterials and Devices Research Group
KAUST Catalysis Center (KCC)
KAUST Solar Center (KSC)
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Ultrafast Laser Spectroscopy and Four-dimensional Electron Imaging Research Group
Online Publication Date2019-08-19
Print Publication Date2019-09-13
Embargo End Date2020-08-19
Permanent link to this recordhttp://hdl.handle.net/10754/658629
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AbstractIn this work, we fabricate photodetectors made of methylammonium lead trihalide perovskite (MLHP) and phosphorus-doped graphitic carbon nitride nanosheets (PCN-S). Using thermal polymerization, PCN-S with a reduced band gap, are synthesized from low-cost precursors, making it feasible to form type-II bulk heterojunctions with perovskites. Owing to the bulk heterojunctions between PCN-S and MLHP, the dark current of the photodetectors significantly decreases from ∼10-9 A for perovskite-only devices to ∼10-11 A for heterojunction devices. As a result, not only does the on/off ratio of the hybrid devices increase from 103 to 105 but also the photodetectivity is enhanced by more than 1 order of magnitude (up to 1013 Jones) and the responsivity reaches a value of 14 A W-1. Moreover, the hybridization of MLHP with PCN-S significantly modifies the hydrophilicity and morphology of the perovskite films, which dramatically increases their stability under ambient conditions. The hybrid photodetectors, described here, present a promising new direction toward stable and efficient optoelectronic applications.
CitationLiu, Z., Zhu, Y., El-Demellawi, J. K., Velusamy, D. B., El-Zohry, A. M., Bakr, O. M., … Alshareef, H. N. (2019). Metal Halide Perovskite and Phosphorus Doped g-C3N4 Bulk Heterojunctions for Air-Stable Photodetectors. ACS Energy Letters, 4(9), 2315–2322. doi:10.1021/acsenergylett.9b01339
SponsorsResearch reported in this publication was funded by King Abdullah University of Science and Technology (KAUST).
PublisherAmerican Chemical Society (ACS)
JournalACS Energy Letters