Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
DOI: https://doi.org/10.29363/nanoge.hopv.2020.072
Publication date: 6th February 2020
The introduction of low-band-gap polymer donors in organic bulk heterojunction solar cells allowed to achieve high power conversion efficiency (PCE) [1]. Such optimal performance are strongly correlated to the use of spin coating as technique to ensure reproducible and homogeneous films and chlorinated solvents that help the suitable nanoscale morphology. But this procedure is not industry compatible since spin coating does not allow large scale production and chlorinated solvents are poorly tolerated in workplaces since they are harmful towards environment and human health [2,3]. For this reason, we realized high-performing inverted polymer solar cells by depositing all the layers through a scalable technique as spray coating [4] by using green solvents. We investigated the morphology at the interface between photoactive layer (PAL) deposited through a non-chlorinated solvent (ortho-xylene) and hole and electron transport layers processed from alcohol based solvents, via atomic force microscopy (AFM). In particular, we analyzed the interface between PAL and an electron transport layer (ETL) fabricated using zinc oxide nanoparticles coated with polyethylenimine ethoxylated (PEIE) [5]. Then, we studied the interface between PAL and three different combination of hole transport layer (HTL)/anode: i) a mixture of two commercial poly(3,4- ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) formulations (CPP:PH1000), ii) an anhydrous PEDOT:PSS (A-PEDOT) dispersion developed in our laboratory, iii) a double layer composed of vanadium (V) oxide (V2O5) and PH1000 electrode. Finally, we evaluated the electrical performance of small area devices (10 mm2) realized using the three typologies of HTL/Anode interfaces, obtaining comparable results in terms of PCE in the case of V2O5/PH1000 (3.25%) and anhydrous PEDOT:PSS (3.6%) when the devices were illuminated from ITO side. By illuminating from the PEDOT side, the PCE decreased of 26% in the case of V2O5/PH1000 and was halved in the case of A-PEDOT. Therefore, we decide to fabricate and electrically characterize organic photovoltaic modules (active area: 13 cm2) with ITO/ZnO-PEIE/PTB7:PC70BM/V2O5/PH1000 structure, by demonstrating the successful application of spray coating for scale-up of Organic Photovoltaics.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
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