Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
During last years power conversion efficiencies of perovskite solar cell have risen to over 15% and future improvements are expected. The typical devices are fabricated using mesoporous TiO2 as electron transporting layer and spiro-OMETAD or P3HT as the hole transporting layer. Recently studies show an inverted planar-heterojunction solar cells on glass/TCO or plastic/TCO using PEDOT:PSS as hole extractor layer with maximum efficiencies of 11.5% and 9.2% respectively (1). As reported in literature PEDOT:PSS functions as an excellent hole extractor and allows to obtain a good perovskite layer formation(2).
In this study we used an highly conductivity PEDOT:PSS PH1000 modified with ethylene glycol, deposited via spray coating as semitransparent anode to obtain a TCO-free perovskite planar-heterojunction solar cells. It combines good optical transmittance and conductivity and this electrode presents following advantages respect common TCO : i) the raw material is very cheap if compared at Indium tin oxide or fluorinated tin oxide ii) it is realized by low cost solution process and iii) it is compatible with large area applications. Using PCBM/TiOx as electron extractor layer the devices with PH1000 as semitransparent anode reached a maximum power conversion efficiencies of 4.9%, which was comparable to conventional PET-ITO based structure (4.5%). Moreover, in the bending test, ITO-free flexible solar cell manifesting superior mechanical robustness, showing the high flexibility of perovskite layer.
This work was financially supported by the European Union under Contract No. 309201 “GO-NEXTS”
(1) Jingbi You, Ziruo Hong, Yang (Michael) Yang, Qi Chen, Min Cai, Tze-Bin Song, Chun-Chao Chen, Shirong Lu, Yongsheng Liu, Huanping Zhou, and Yang Yang, Low-Temperature Solution-Processed Perovskite Solar Cells with High Efficiency and Flexibility. ACS Nano, 2014, 8 (2), pp 1674–1680. (2) Pablo Docampo,James M. Ball,Mariam Darwich, Giles E. Eperon & Henry J. Snaith, Efficient organometal trihalide perovskite planar-heterojunction solar cells on flexible polymer substrates. Nature Communications,2013, 4,Article number:2761
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