Please specify both organic and Inorganic materials for ETL and HTL.
ZnO precursor solution (sZnO) as the electron transport/extraction layers was reported by Hau et al. [1].
In total, research in the field of the solution-processed organic polymer solar cells has already demonstrated that using i-ZnO, Al3+-doped ZnO or TiO2 as electron transport/extraction interfaces and WO3, MoO3 or V2O5 as hole transport/extraction interlayers are viable strategies[2-5].
[1] Hau, S.K.; Yip, H.-L.; Baek, N.S.; Zou, J.; O’Malley, K.; Jen, A.K.Y. Air-stable inverted flexible polymer solar cells using zinc oxide nanoparticles as an electron selective layer. Appl. Phys. Lett. 2008, 92, 253301:1–253301:3.
[2] Park, H.-J.; Lee, K.-H.; Kumar, B.; Shin, K.-S.; Jeong, S.-W.; Kim, S.-W. Inverted organic solar cells with ZnO thin films prepared by sol–gel method. J. Nanoelectron. Optoelectron. 2010, 5,135–138.
[3]. Bolognesi, M.; Sanchez-Diaz, A.; Ajuria, J.; Pacios, R.; Palomares, E. The effect of selective contact electrodes on the interfacial charge recombination kinetics and device efficiency of organic polymer solar cells. Phys. Chem. Chem. Phys. PCCP 2011, 13, 6105–6109.
[4]. Chen, C.-P.; Chen, Y.-D.; Chuang, S.-C. High-performance and highly durable inverted organic photovoltaics embedding solution-processable vanadium oxides as an interfacial hole-transporting layer. Adv. Mater. 2011, 23, 3859–3863.
[5]. Oh, H.; Krantz, J.; Litzov, I.; Stubhan, T.; Pinna, L.; Brabec, C.J. Comparison of various sol–gel derived metal oxide layers for inverted organic solar cells. Sol. Energy Mater. Sol. Cells 2011, 95, 2194–2199.
Dear Sai,
I think you got an answer. However, as a matter of fact all the llectron and hole transport layers as window layers must have a bandgap greater than the active material which is normally for organic material is about 2 eV. As these layers must have bandgap greater than 2eV, then they will be transparent to the Mid and Far infrared with photon energies smaller than about 1 eV. There are organic HTL and metallic HTL and there are metallic ETL. You can find them all by searching the web for review papers on organic solar cells.
Best wishes
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