Berlin 2012 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HL: Fachverband Halbleiterphysik
HL 72: Poster Session: Si-based Photovoltaics / Inorganic Photovoltaics / Structure and Transport in Organic Photovoltaics / Organic Semiconductors
HL 72.5: Poster
Mittwoch, 28. März 2012, 16:00–19:00, Poster D
Structural, electronic and optical properties of random-pyramid textured Silicon wafers — •Jan Kegel1, Heike Angermann2, Abdelazize Laades3, Uta Stürzebecher3, and Bert Stegemann1 — 1University of Applied Sciences (HTW) Berlin, Wilhelminenhofstr. 75a, 12459 Berlin — 2Helmholtz-Zentrum für Materialien und Energie Berlin, Kekuléstr. 5, 12489 Berlin — 3CiS Institut für Mikrosensorik und Photovoltaik, Konrad-Zuse-Str. 14, 99099 Erfurt
In high-efficiency crystalline silicon solar cells, the surfaces of the Si wafers can be textured to reduce reflection losses and to increase the absorption probability by light trapping. This texturing is produced by anisotropic wet-chemical etching of random pyramid structures. The improvement of the optical properties, however, is associated with a larger effective surface area, which inherently corresponds to an increased number of electrically active defect states in the band gap. In this paper, a detailed, quantitative analysis of the micro-roughness of the textured Si wafers was performed. Subsequent surface conditioning was optimized with respect to efficient interface passivation as elucidated by surface photovoltage (SPV) measurements. Data on surface morphology is correlated to light-trapping behavior and interface state densities in order to identify Si wafer pre-treatment conditions for optimal solar cell performance.