Sentaurus modelling of 6.9% Cu^sub 2^ZnSnS^sub 4^ device based on comprehensive electrical & optical characterization

In this work we perform comprehensive characterization on a 6.9% pure sulphide Cu2ZnSnS4 (CZTS) device and construct a 2D device model in Sentaurus TCAD to identify possible roots of performance bottlenecks. Electrical and optical parameters of the absorber from comprehensive electrical and optical...

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Bibliographic Details
Published in:Solar energy materials and solar cells 2017-02, Vol.160, p.372
Main Authors: Pu, Aobo, Ma, Fajun, Yan, Chang, Huang, Jialiang, Sun, Kaiwen, Green, Martin, Hao, Xiaojing
Format: Article
Language:English
Subjects:
Absorbers
Absorptivity
Chemical elements
Computer simulation
Electrical properties
Luminescence
Mathematical models
Modelling
Optical properties
Parameter identification
Photoluminescence
Photons
Quantum efficiency
Recombination
Spectral sensitivity
Studies
Sulfides
Two dimensional models
Variation
Velocity
VOCs
Volatile organic compounds
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Summary:In this work we perform comprehensive characterization on a 6.9% pure sulphide Cu2ZnSnS4 (CZTS) device and construct a 2D device model in Sentaurus TCAD to identify possible roots of performance bottlenecks. Electrical and optical parameters of the absorber from comprehensive electrical and optical characterization, together with other necessary parameters from literature, we successfully reproduce measured current density-voltage (J-V) and external quantum efficiency (EQE) curves. Absorption coefficient is extracted by fitting measured internal quantum efficiency (IQE). At the buffer/absorber interface, a surface recombination velocity of 1x105 cm/s is identified to adequately describe measured spectral response at the near-interface region. Furthermore, a bulk lifetime of ~29 ns is extracted from effective lifetime modelling in conjunction with time resolved photoluminescence (TRPL) results. The key underlying Voc, deficit, ~200 mV, is pinpointed to bandgap fluctuation, which is backed by the simulation study on both QE tail and steady state photoluminescence.
ISSN:0927-0248