title: Fabrication of solution processed 3D nanostructured CuInGaS₂ thin film solar cells.
abstract: In this study we demonstrate the fabrication of CuInGaS₂ (CIGS) thin film solar cells with a three-dimensional (3D) nanostructure based on indium tin oxide (ITO) nanorod films and precursor solutions (Cu, In and Ga nitrates in alcohol). To obtain solution processed 3D nanostructured CIGS thin film solar cells, two different precursor solutions were applied to complete gap filling in ITO nanorods and achieve the desirable absorber film thickness. Specifically, a coating of precursor solution without polymer binder material was first applied to fill the gap between ITO nanorods followed by deposition of the second precursor solution in the presence of a binder to generate an absorber film thickness of ∼1.3 μm. A solar cell device with a (Al, Ni)/AZO/i-ZnO/CdS/CIGS/ITO nanorod/glass structure was constructed using the CIGS film, and the highest power conversion efficiency was measured to be ∼6.3% at standard irradiation conditions, which was 22.5% higher than the planar type of CIGS solar cell on ITO substrate fabricated using the same precursor solutions.
authors.affiliation: Clean Energy Research Center, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Seongbuk-gu, Seoul 136-791, Republic of Korea. University of Science and Technology, 176 Gajeong-dong, 217 Gajeongro Yuseong-gu, Daejeon 305-350, Republic of Korea.
authors.forename: Van Ben
authors.initials: VB
authors.lastname: Chu
authors.forename: Jin Woo
authors.initials: JW
authors.lastname: Cho
authors.forename: Se Jin
authors.initials: SJ
authors.lastname: Park
authors.forename: Yun Jeong
authors.initials: YJ
authors.lastname: Hwang
authors.forename: Hoo Keun
authors.initials: HK
authors.lastname: Park
authors.forename: Young Rag
authors.initials: YR
authors.lastname: Do
authors.forename: Byoung Koun
authors.initials: BK
authors.lastname: Min