Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
State-of-the art power conversion efficiencies (PCEs) of polymer solar cells (PSCs) have overpassed 13% on lab-fabricated devices, i.e. small area, glass supported solar cells, not suited for practical commercial application. [1]. For this aim, flexible PSC modules are envisaged as the best product as they can be fabricated using R2R processes [2], reducing costs because of a scaled-up production. However, technical unsolved problems still limit a high throughput production. Among these, we chose to focus on possible R2R printable layers to replace the thermally evaporated top buffer layer. In particular, in lab-scale devices, thermally evaporated MoOx is the election buffer layer of election in almost all spin-coated devices, while the most common printable buffer layer presently used for inverted architecture PSC is based on PEDOT inks. The latter work fine with P3HT and a few other polymers but it does not when combined with active layers based on several low band gap (LBG) polymers. Soluble transition metal derivatives have been suggested as possible alternative materials to PEDOT:PSS, but there are still inconvenients in their use [3]. We here describe alcoholic solutions of metallic polyoxometalate (M-POMs) as printable inks to be used as anodic interlayers in inverted PSCs, but also suited in conventional devices to replace PEDOT:PSS. These inks consist in solutions of a metal-based compound in alcohol such as ethanol. We here show that the results (PSC photovoltaic parameters) obtained by depositing this solution on the active layer of the devices by spin-coating are equal or better compared to the thermally evaporated MoOx layer. We also demonstrate the compatibility of this kind of inks with several active layers and show that the ink we propose is compatible with printing techniques.
[1] R. Po, A. Bernardi, A. Calabrese, C. Carbonera, G. Corso, A. Pellegrino, Energy Environ. Sci., 2014, 7, 925-943
[2] F. C. Krebs, Solar Energy Materials and Solar Cells, 93(4), 2009, 394-412; F. C. Krebs, Solar Energy Materials and Solar Cells, 93(4), 2009, 465-475.
[3] Mei-Feng Xu, Lin-Song Cui, Xiao-Zhao Zhu, Chun-Hong Gao, Xiao-Bo Shi, Zhi-Ming Jin,Zhao-Kui Wang, Liang-Sheng Liao, Organic Electronics, 2013, 14(2), 657–664
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