Journal
ADVANCED MATERIALS INTERFACES
Volume 6, Issue 1, Pages -Publisher
WILEY
DOI: 10.1002/admi.201801419
Keywords
charge transfer; graphene; interfaces; organometal halide perovskite; photodetectors
Funding
- US National Science Foundation [DMR-1337737, DMR-1508494, DMR-1351716]
- University of Kansas General Research Fund [2151080]
- Army Research Office [W911NF-16-1-0029]
- Natural Science Foundation of China [61475017, 61775011]
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Graphene, a single layer conductor, can be combined with other functional materials for building efficient optoelectronic devices. However, transferring large-area graphene onto another material often involves dipping the material into water and other solvents. This process is incompatible with water-sensitive materials such as organometal halide perovskites. Here, a dry method is used and succeeded, for the first time, in stacking centimeter-sized graphene directly onto methylammonium lead iodide thin films without exposing the perovskite film to any liquid. Photoemission spectroscopy and nanosecond time-resolved photoelectrical measurement show that the graphene/perovskite interface does not contain significant amount of contaminants and sustain efficient interfacial electron transfer. The use of this method in fabricating graphene-on-perovskite photodetectors is further demonstrated. Besides a better photoresponsivity compared to detectors fabricated by the conventional perovskite-on-graphene structure, this dry transfer method provides a scalable pathway to incorporate graphene in multilayer devices based on water-sensitive materials.
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