Colloidal Solution-Processed CuInSe2 Solar Cells with Significantly Improved Efficiency up to 9% by Morphological Improvement

Title
Colloidal Solution-Processed CuInSe2 Solar Cells with Significantly Improved Efficiency up to 9% by Morphological Improvement
Authors
임예슬권형순정증현김진영김홍곤고민재정운룡이도권
Keywords
CuInSe2; thin-film solar cells; Cu-In; nanoparticles; packing density; cold-isostatic pressing
Issue Date
2014-01
Publisher
ACS Applied Materials & Interfaces
Citation
VOL 6, NO 1, 259-267
Abstract
We demonstrate here that an improvement in the green density leads to a great enhancement in the photovoltaic performance of CuInSe2 (CISe) solar cells fabricated with Cu−In nanoparticle precursor films via colloidal solution deposition. Cold-isostatic pressing (CIP) increases the precursor film density by ca. 20%, which results in an appreciable improvement in the microstructural features of the sintered CISe film in terms of a lower porosity, a more uniform surface morphology, and a thinner MoSe2 layer. The low-band-gap (1.0 eV) CISe solar cells with the CIP-treated films exhibit greatly enhanced open-circuit voltage (VOC, typically from 0.265 to 0.413 V) and fill factor (FF, typically from 0.34 to 0.55), compared to the control devices. As a consequence, an almost 3-fold increase in the average efficiency, from 3.0 to 8.2% (with the highest value of 9.02%), is realized. Diode analysis reveals that the enhanced VOC and FF are essentially attributed to the reduced reverse saturation current density and diode ideality factor. This is associated with suppressed recombination, likely due to the reduction in recombination sites at grain/air surfaces, intergranular interfaces, and defective CISe/CdS junctions. From the temperature dependences of VOC, it is revealed that CIP-treated devices suffer less from interface recombination
URI
http://pubs.kist.re.kr/handle/201004/47012
ISSN
19448244
Appears in Collections:
KIST Publication > Article
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