Gödel Karl C, Roose Bart, Sadhanala Aditya, Vaynzof Yana, Pathak Sandeep K, Steiner Ullrich
Cavendish Laboratory, Department of Physics, University of Cambridge, UK.
Adolphe Merkle Institute, Rue des Verdiers, Fribourg, Switzerland.
Phys Chem Chem Phys. 2017 Jan 4;19(2):1425-1430. doi: 10.1039/c6cp07559b.
We investigate the effect of a post heat treatment of the absorber layer in air for antimony sulfide (SbS) sensitized solar cells. Phenomenologically, exposing the SbS surface of sensitised solar cells to air at elevated temperatures is known to improve device performance. Here, we have investigated the detailed origins of this improvement. To this end, samples were annealed in air for different time periods and the build-up of an antimony oxide layer was monitored by XPS. A very short heat treatment resulted in an increase in power conversion efficiency from η = 1.4% to η = 2.4%, while longer annealing decreased the device performance. This improvement was linked to a reduction in charge carrier recombination at the interface of SbS with the organic hole conductor, arising from the oxide barrier layer, as demonstrated by intensity modulated photovoltage spectroscopy (IMVS).
我们研究了硫化锑（SbS）敏化太阳能电池吸收层在空气中进行后热处理的效果。从现象学角度来看，已知在高温下将敏化太阳能电池的SbS表面暴露于空气中可提高器件性能。在此，我们研究了这种性能提升的具体根源。为此，将样品在空气中退火不同时间段，并通过X射线光电子能谱（XPS）监测氧化锑层的形成。非常短的热处理使功率转换效率从η = 1.4%提高到了η = 2.4%，而较长时间的退火则降低了器件性能。如强度调制光电压谱（IMVS）所示，这种性能提升与氧化阻挡层导致的SbS与有机空穴导体界面处电荷载流子复合减少有关。
