Journal
ADVANCED MATERIALS
Volume 29, Issue 39, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201702759
Keywords
MAPbI(3); nanosheets; PbI2; photodetection; physical vapor deposition (PVD)
Categories
Funding
- General Research Fund of the Research Grants Council of Hong Kong SAR, China [CityU 11275916]
- National Natural Science Foundation of China [51672229, 61605024]
- Science Technology and Innovation Committee of Shenzhen Municipality [JCYJ20160229165240684]
- Shenzhen Research Institute, City University of Hong Kong
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Recently, due to the possibility of thinning down to the atomic thickness to achieve exotic properties, layered materials have attracted extensive research attention. In particular, PbI2, a kind of layered material, and its perovskite derivatives, CH3NH3PbI3 (i.e., MAPbI(3)), have demonstrated impressive photoresponsivities for efficient photodetection. Herein, the synthesis of large-scale, high-density, and freestanding PbI2 nanosheets is demonstrated by manipulating the microenvironment during physical vapor deposition. In contrast to conventional two-dimensional (2D) growth along the substrate surface, the essence here is the effective nucleation of microplanes with different angles relative to the in-plane direction of underlying rough-surfaced substrates. When configured into photodetectors, the fabricated device exhibits a photoresponsivity of 410 mA W-1, a detectivity of 3.1 x 10(11) Jones, and a fast response with the rise and decay time constants of 86 and 150 ms, respectively, under a wavelength of 405 nm. These PbI2 nanosheets can also be completely converted into MAPbI(3) materials via chemical vapor deposition with an improved photoresponsivity up to 40 A W-1. All these performance parameters are comparable to those of state-of-the-art layered-material-based photodetectors, revealing the technological potency of these freestanding nanosheets for next-generation high-performance optoelectronics.
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