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Title: New insights into the nanostructure of innovative thin film solar cells gained by positron annihilation spectroscopy
Authors: Eijt, S.W.H
Shi, W
Mannheim, A
Butterling, M
Schut, H
Egger, W
Dickmann, M
Hugenschmidt, C
Shakeri, B
Meulenberg, R.W
Callewaert, V
Saniz, R
Partoens, B
Barbiellini, B
Bansil, A 
Melskens, J
Zeman, M
Smets, A.H.M
Kulbak, M
Hodes, G
Cahen, D
Brück, E
Keywords: Autocorrelation
Electronic structure
Fourier transforms
Particle beams
Perovskite solar cells
Positron annihilation spectroscopy
Semiconductor quantum dots
Silicon solar cells
Solar cells
Thin films
Angular correlation of annihilation radiations
Autocorrelation functions
CdSe quantum dots
Doppler broadening of annihilation radiations
Fourier transformations
Momentum distributions
Positron annihilation lifetime spectroscopy
Positron trapping
Thin film solar cells
Issue Date: 2017
Citation: Eijt, S.W.H, Shi, W, Mannheim, A, Butterling, M, Schut, H, Egger, W, Dickmann, M, Hugenschmidt, C, Shakeri, B, Meulenberg, R.W, Callewaert, V, Saniz, R, Partoens, B, Barbiellini, B, Bansil, A, Melskens, J, Zeman, M, Smets, A.H.M, Kulbak, M, Hodes, G, Cahen, D, Brück, E (2017). New insights into the nanostructure of innovative thin film solar cells gained by positron annihilation spectroscopy. Journal of Physics: Conference Series 791 (1) : 12021. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: Recent studies showed that positron annihilation methods can provide key insights into the nanostructure and electronic structure of thin film solar cells. In this study, positron annihilation lifetime spectroscopy (PALS) is applied to investigate CdSe quantum dot (QD) light absorbing layers, providing evidence of positron trapping at the surfaces of the QDs. This enables one to monitor their surface composition and electronic structure. Further, 2D-Angular Correlation of Annihilation Radiation (2D-ACAR) is used to investigate the nanostructure of divacancies in photovoltaic-high-quality a-Si:H films. The collected momentum distributions were converted by Fourier transformation to the direct space representation of the electron-positron autocorrelation function. The evolution of the size of the divacancies as a function of hydrogen dilution during deposition of a-Si:H thin films was examined. Finally, we present a first positron Doppler Broadening of Annihilation Radiation (DBAR) study of the emerging class of highly efficient thin film solar cells based on perovskites. @ Published under licence by IOP Publishing Ltd.
Source Title: Journal of Physics: Conference Series
ISSN: 17426588
DOI: 10.1088/1742-6596/791/1/012021
Rights: Attribution 4.0 International
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