Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
A modified two-step method was employed to fabricate mesoporous perovskite solar cells, where the PbI2 coated photoanode was firstly dipped into low concentration methylammonium iodine (MAI) solution and then spin-coated with a higher concentration MAI solution. Compared with the normal two-step method, this method resulted not only in pin-hole free but also much more uniform perovskite films revealed by much smaller variation in the large-area PL image. Based on this method, the mesoporous TiO2 film thickness was then carefully varied from 330 nm to 130 nm, in order to see how it affects the perovskite film formation, the charge transport and thus the photovoltaic performance of the as-prepared device. The as-prepared perovskite filmswere found to be sensitive towards the atmosphere in the glove box (usually isopropanol, IPA), which could decompose the perovskite into PbI2as tracked by XRD patterns. Residual PbI2 crystals were also detected in thinner mesoporous TiO2 film based photoanodes. After being incorporated into solar cells, both open-circuit voltage (Voc) and fill factor (FF) yields were significantly improved without short-circuit current (Jsc) penaltyby decreasing the thickness of ms-TiO2 layer, eventually obtaining Voc of 1.08 V, Jsc of 20.7 mAcm-2 and FF of 0.69 with 15.3% efficiency using 130nm mesoporous TiO2.Compared to the planar structure, the insertion of this very thin mesoporous TiO2 layer led to a higher and much more repeatable photovoltaic performance, consistent with effectively inhibited recombination seen in PL mapping analysis. Further electrochemical impedance spectroscopy analysis revealed that thinner mesoporous films could inhibit the recombination more and also resulted in smaller series resistance, thus contributing to better photovoltaic performance.Finally, this very uniform photoanode with high quality charge transfer properties was fabricated into large-area (2.25 cm2) devices, achieving an impressive efficiency exceeding 11%.
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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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