TY - JOUR A1 - Heidmann, B. A1 - Andree, Stefan A1 - Levcenko, S. A1 - Unold, T. A1 - Abou-Ras, D. A1 - Schäfer, N. A1 - Bonse, Jörn A1 - Krüger, Jörg A1 - Schmid, M. T1 - Fabrication of regularly arranged chalcopyrite micro solar cells via femtosecond laser-induced forward transfer for concentrator application T2 - ACS Applied Energy Materials N2 - A laser-based bottom-up technique for the fabrication of Cu(In,Ga)Se2 (CIGSe) micro solar cells is presented. We use femtosecond laser-induced forward transfer (LIFT) to transport a metallic precursor composed of copper, indium, and gallium onto a molybdenum back contact layer on a glass substrate. A CIGSe absorber forms by subsequent selenization. An array of micro absorbers with defined spacing is fabricated to solar cells and characterized under concentrated light illumination. The solar cell array exhibited a conversion efficiency of 1.4‰ at 1 sun as well as a significant efficiency enhancement of 68% rel. under 20-fold concentration. This work demonstrates the possibility of directly grown micrometer-sized solar cells based on chalcogenide absorber layers, enabling effective material usage. PB - ACS CY - Washington, DC KW - Micro solar cells KW - Light concentration KW - LIFT KW - Chalcopyrite KW - Femtosecond laser PY - 2018 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/43999 AN - OPUS4-43999 SN - 2574-0962 VL - 1 IS - 1 SP - 27 EP - 31 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany