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Investigation of photocarrier losses in pyrite (FeS2) film consisting single crystal nanocubes
Sudhanshu Shukla1; Thirumany Sritharan2; Xiong Qihua3; Tze Chien Sum3; Guichuan Xing3; Nripan Mathews1,2; Hu Ge2; Thirumalai Venkatesan4,5; Sinu Mathew4,5; Su Zhenghua1; Venkatram Nalla6
2017
Conference NameProceedings of the 2nd World Congress on Recent Advances in Nanotechnology (RAN’17)
Source PublicationWorld Congress on Recent Advances in Nanotechnology
Conference DateApril 4 – 6, 2017
Conference PlaceBarcelona, Spain
Abstract

Successful extraction of photo excited carriers from a photo active material is key towards a successful PV device. The high losses exhibited by a device with pyrite as the active layer has been noted previously but never investigated systematically to understand the photo physics and the carrier loss mechanisms to improve its performance. Here we report a detailed characterization of a film made using (100) terminated, pure pyrite single crystal nano cubes. Using ultrafast transient absorption spectroscopy we found fast carrier localization of photo excited carriers to indirect band edge and shallow trap states with characteristic decay time of 1.8 picoseconds, followed by relaxation to deep states and recombination of trapped carriers with long characteristic decay times of 50-990 nanoseconds. Its optical absorption characteristics correlate to a disordered semiconductor. Temperature dependent electrical resistivity exhibits a Mott - variable range hopping (VRH) type conduction mechanism consistent with the presence of high density of defect states. An electron band model with midgap defect states is formulated that could explain all the observed phenomena.

KeywordCarrier Dynamics Magnetization Nanocubes Optical Transient Absorption Spectroscopy Variable Range Hopping
DOIhttp://doi.org/10.11159/icnnfc17.118
URLView the original
Language英语
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Document TypeConference paper
CollectionInstitute of Applied Physics and Materials Engineering
Affiliation1.Energy Research Institute, Nanyang Technological University Nanyang Avenue, Singapore
2.School of Materials Science and Engineering, Nanyang Technological University Nanyang Avenue, Singapore
3.Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University Singapore
4.Department of Electrical and Computer Engineering, National University of Singapore Singapore
5.NUSNNI-Nanocore, National University of Singapore Singapore
6.Centre for Disruptive Photonics Technologies, National University of Singapore Singapore
Recommended Citation
GB/T 7714
Sudhanshu Shukla,Thirumany Sritharan,Xiong Qihua,et al. Investigation of photocarrier losses in pyrite (FeS2) film consisting single crystal nanocubes[C],2017.
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