Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Monovalentcation halides with similar ionic radii to Pb2+, including Cu+, Na+, and Ag+, havebeen added to explore the possibility of doping. Significant reduction of sub-bandgapoptical absorption and lower energetic disorder along with a shift in theFermi level of the perovskite in the presence of these cations has been observed.The bulk hole mobility of the additive-based perovskites as estimated using thespace charge limited current method exhibits an increase of up to an order ofmagnitude compared to the pristine perovskites with a significant decrease inthe activation energy. These observations indicate that the additives seem to passivate the hole traps in the surface (or grain boundaries) of perovskite films, which results in an enhancement of short circuit current and, hence, the overall efficiency of the solar cell. In addition, a better conversion of lead iodide into CH3NH3PbI3 structure is achieved for NaI- and CuBr-based films, which was confirmed by X-ray diffraction and, for CuI- and AgI based perovskite a uniform film with a continuous coverage is formed. The confluence of aforementioned favorable properties led to the enhancement of power conversion efficiency to 15.14%, 15.25%, and 15.61% for NaI-, CuI-, and CuBr based devices, respectively, in comparison with 14.01% for the additive-free reference cell.
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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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