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

Authors
Lim, Ye SeulKwon, Hyung-SoonJeong, JeunghyunKim, Jin YoungKim, HonggonKo, Min JaeJeong, UnyongLee, Doh-Kwon
Issue Date
2014-01-08
Publisher
American Chemical Society
Citation
ACS Applied Materials & Interfaces, v.6, no.1, pp.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 (V-OC, 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 V-OC 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 V-OC, it is revealed that CIP-treated devices suffer less from interface recombination.
Keywords
THIN-FILM; ALLOY NANOPARTICLES; NANOCRYSTAL INKS; PHOTOVOLTAIC PERFORMANCE; ELECTRONIC-PROPERTIES; PRECURSOR SOLUTION; DEPOSITION; ABSORBER; OXIDE; DENSE; THIN-FILM; ALLOY NANOPARTICLES; NANOCRYSTAL INKS; PHOTOVOLTAIC PERFORMANCE; ELECTRONIC-PROPERTIES; PRECURSOR SOLUTION; DEPOSITION; ABSORBER; OXIDE; DENSE; CuInSe2; thin-film solar cells; Cu-In; nanoparticles; packing density; cold-isostatic pressing
ISSN
1944-8244
URI
https://pubs.kist.re.kr/handle/201004/127225
DOI
10.1021/am4040976
Appears in Collections:
KIST Article > 2014
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML

qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE