Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Hybrid solar cells fabricated using organic and inorganic materials have been actively pursued in recent years [1]. They leverage on the combined merits of both types of materials, such as high carrier mobility and stability of inorganic materials, and simple solution based low temperature and low cost processing of organic materials. Hybrid Si/PEDOT:PSS solar cells combined with Si nanostructures to improve light absorption have demonstrated a remarkable power conversion efficiency (PCE) of 13%, achieved at a relatively lower cost compared to conventional crystalline Si solar cells [2].Various Si nanostructures such as Si nanowires (SiNWs), nanoholes (SiNHs), nanocones, inverted nanopyramid, etc. have been investigated for light trapping in hybrid cells. In this work we study hybrid cells based on a hybrid nanostructures of random silicon nanowires in periodic nanoholes fabricated using the polystyrene (PS) sphere assisted lithography [3]. PS spheres with 620 nm diameter were used to fabricate periodic SiNHs structure with periodicity same as the diameter. After PS spheres deposition on Si substrate using lift up method, oxygen plasma etching was used to reduce the size of the PS spheres, so as to control the diameter of the SiNHs formed. A thin layer of chromium was deposited in between the PS spheres to protect Si from etching. After PS spheres removal, the two step metal assisted chemical etching (MACE) technique was used to etch the Si and fabricate SiNWs in the SiNHs, as shown in Fig. 1. This hybrid structure benefits from: i) strong light scattering and absorption arising from both the SiNWs and SiNHs; ii) large Si to polymer contact area; iii) lower series resistance and iv) better mechanical properties of SiNH as compared to a structure based solely on fragile SiNWs [4]. Si/PEDOT:PSS solar cells have been fabricated using the hybrid nanostructures and a PCE of 9.01% has been achieved. The efficiency can be further improved with the optimization of the periodicity of the structure, diameter of the SiNHs and structural parameters of the SiNWs.
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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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