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/content/aip/journal/adva/5/10/10.1063/1.4932512
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/content/aip/journal/adva/5/10/10.1063/1.4932512
2015-10-01
2016-09-25

Abstract

Atomic layer deposited (ALD) Al O films on Cu(In,Ga)Se (CIGS) surfaces have been demonstrated to exhibit excellent surface passivation properties, which is advantageous in reducing recombination losses at the rear metal contact of CIGS thin-film solar cells. Here, we report, for the first time, experimentally extracted electronic parameters, i.e. fixed charge density ( ) and interface-trap charge density ( ), for as-deposited (AD) and post-deposition annealed (PDA) ALD Al O films on CIGS surfaces using capacitance–voltage (C-V) and conductance-frequency (G-f) measurements. These results indicate that the AD films exhibit positive fixed charges (approximately 1012 cm−2), whereas the PDA films exhibit a very high density of negative fixed charges (approximately 1013 cm−2). The extracted values, which reflect the extent of chemical passivation, were found to be in a similar range of order (approximately 1012 cm−2 eV−1) for both AD and PDA samples. The high density of negative in the bulk of the PDA Al O film exerts a strong Coulomb repulsive force on the underlying CIGS minority carriers (n), preventing them to recombine at the CIGS/AlO interface. Using experimentally extracted Q and D values, SCAPS simulation results showed that the surface concentration of minority carriers ( ) in the PDA films was approximately eight-orders of magnitude lower than in the AD films. The electrical characterization and estimations presented in this letter construct a comprehensive picture of the interfacial physics involved at the Al O/CIGS interface.

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