Two-dimensional (2D) molybdenum disulfide (MoS2) has attracted much attention as a promising next-generation optoelectronic device. In particular, multilayer MoS2 has superior optical properties compared to mono- or few-layer MoS2 because of its higher
density of states and wider spectral response. However, as the number of layers increases, multilayer MoS2 becomes indirect, resulting in poor light absorption and low photoresponsivity. Here, we report the enhanced photocurrent response of a multilayer MoS2 thin-film
transistor by stacking an organometal halide perovskite (CH3NH3PbI3) layer on top of the multilyaer MoS2. With the perovskite overlayer, the photocurrent increased by two orders of magnitude, and thus our proposed hybrid phototransistor exhibited
significantly enhanced photoresponsivity of ˜1.1 A/W as well as detectivity of ˜9 × 1010 Jones compared to the MoS2 phototransistor without the perovskite layer. We also observe that the electrical properties change because of the effect of the overlayer.
Our result indicates that multilayer MoS2 with a CH3NH3PbI3 overlayer can be a promising structure for high-performance MoS2-based photodetector applications.
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Document Type: Research Article
Department of Electrical and Computer Engineering, Ajou University, Suwon 16499, South Korea
Division of Energy Systems Research, Ajou University, Suwon 16499, South Korea
School of Electronic and Electrical Engineering, Sungkyunkwan University, Suwon 16419, South Korea
School of Electronic Engineering, Soongsil University, Seoul 156-743, South Korea
Publication date: November 1, 2016
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Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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