Improving the Performance of Inorganic-Organic Hybrid Perovskite Solar Cells by Solvent Engineering
Ruiyao Wang a, Tianhao Yan a, Lianping Zhang b, Qun Luo b, Changqi Ma b
a Printable Electronics Research Centre, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, 398 Ruoshui Road, Suzhou, Jiangsu, 215123, China
Materials for Sustainable Development Conference (MATSUS)
Proceedings of September Meeting 2016 (NFM16)
Berlin, Germany, 2016 September 5th - 13th
Organizers: Marin Alexe, Enrique Cánovas, Celso de Mello Donega, Ivan Infante, Thomas Kirchartz, Maksym Kovalenko, Federico Rosei, Lukas Schmidt-Mende, Laurens Siebbeles, Peter Strasser, Teodor K Todorov, Roel van de Krol and Ulrike Woggon
Oral, Ruiyao Wang, presentation 224
Publication date: 14th June 2016

Organolead trihalide perovskite materials have been successfully used as light absorbers in efficient photovoltaic cells. Inverted planar perovskite(PVSK) solar cells with a device structure of ITO/PEDOT:PSS/PVSK/PCBM/Al have emerged as a new generation solar cell owing to their advantages, such as ease of fabrication, low processing temperature and good compatibility with roll to roll processing. Solvent engineering has been proved to be a very effective way to enhance the performance of the solar cells by improving the coverage, the thickness and the morphology of the perovskite films. Here we report the effects of the mixed solvents of N, N-dimethylformamide (DMF) and γ-butyrolactone (GBL) on the performance of the solar cells with a device structure of ITO/PEDOT:PSS/CH3NH3PbI3-xClx/PCBM/Al. For example, when the pure GBL was used as the solvent, the devices gave an average PCE 9.27% (Voc = 0.97 V, FF = 0.67, Jsc(calcd) = 14.34 mA/cm2), while with the mixed solvent (GBL:DMF = 3:1(v/v)), the average PCE became 11.07% (Voc = 0.89 V, FF = 0.72, Jsc (calcd) = 17.44 mA/cm2), an increase of 19.4%. The perovskite films from the different solvents were characterized by UV-Vis, XRD and SEM.



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