NDLI: Ultrasensitive solution-processed broad-band photodetectors using CH3NH3PbI3 perovskite hybrids and PbS quantum dots as light harvesters

Content Provider	Royal Society of Chemistry (RSC)
Author	Wang, Enmin Wang, Kai Heeger, Alan J. Liu, Chang Du, Pengcheng Gong, Xiong
Copyright Year	2015
Abstract	Sensing from ultraviolet-visible to infrared is critical for both scientific and industrial applications. In this work, we demonstrate solution-processed ultrasensitive broad-band photodetectors (PDs) utilizing organolead halide perovskite materials (CH3NH3PbI3) and PbS quantum dots (QDs) as light harvesters. Through passivating the structural defects on the surface of PbS QDs with diminutive molecular-scaled CH3NH3PbI3, both trap states in the bandgap of PbS QDs for charge carrier recombination and the leakage currents occurring at the defect sites are significantly reduced. In addition, CH3NH3PbI3 itself is an excellent light harvester in photovoltaics, which contributes a great photoresponse in the ultraviolet-visible region. Consequently, operated at room temperature, the resultant PDs show a spectral response from 375 nm to 1100 nm, with high responsivities over 300 mA W−1 and 130 mA W−1, high detectivities exceeding 1013 Jones (1 Jones = 1 cm Hz1/2 W−1) and 5 × 1012 Jones in the visible and near infrared regions, respectively. These device performance parameters are comparable to those from pristine inorganic counterparts. Thus, our results offer a facile and promising route for advancing the performance of broad-band PDs.
Starting Page	16460
Ending Page	16469
Page Count	10
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	7
Issue Number	39
Journal	Nanoscale
DOI	10.1039/c5nr04575d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Jones Perovskite Organolead compound Infrared Carrier generation and recombination Halogen Band gap Quantum tunnelling Photovoltaics
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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