Dresden 2014 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

HL: Fachverband Halbleiterphysik

HL 7: Organic electronics and photovoltaics I (organized by CPP)

HL 7.9: Talk

Monday, March 31, 2014, 12:00–12:15, ZEU 222

Highly Efficient Silicon/Polythiophene Hybrid Solar Cell Devices — •Matthias Zellmeier¹, Johannes Frisch², Silvia Janietz³, Norbert Koch², Jörg Rappich¹, and Norbert Nickel¹ — ¹Helmholtz-Zentrum Berlin, Institut für Silizium Photovoltaik, Kekulèstr. 5, D-12489 Berlin — ²Humboldt-Universität zu Berlin, Institut für Physik, Brook-Taylor-Str. 6,D-12489 Berlin — ³Fraunhofer-Institut für Angewandte Polymerforschung IAP, Abteilung Polymere und Elektronik, Geiselbergstr. 9, D-14476 Potsdam

Highly efficient hybrid solar cell devices based on crystalline silicon with three different solution processed polymer emitter layers are realized. The inorganic part of the device is optimized with a hole-selective back contact (BSF) and a low defect density hot water oxide (D_it=2×10^-12 eV^-1cm^-2), which provides the necessary wetting properties for the solution processed emitter layers. The applied polymer materials, e.g. poly(3-hexylthiophene-2,5-diyl) (P3HT), poly(3-[3,6-dioxaheptyl]-thiophene) (P3DOT), and poly(3-[2,5,8-trioxanonyl]-thiophene) (P3TOT), differ mainly in the oxygen content in the side groups. Substituting the alkyl chains attached to the thiophene rings with ether groups leads to a modified layer formation during spin coating. The results of the optical, electrical and structural characterization of the polymer layers is correlated to the key figures in the final devices. The open circuit voltage V_OC increases from 0.3 V to 0.5 V and the short circuit current j_SC increases from 15.2 mA cm^-2 up to 28.3 mA cm^-2 in the sequence P3HT, P3DOT, P3TOT and results in a power conversion efficiency close to 10 % for a planar Si/P3TOT device.