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Ambient-processed Low-cost Perovskite-based Photovoltaics
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Perovskite solar cells (PSC) are one of the most promising photovoltaic (PV) technologies due to their quick and simple production, as well as their exceptional optoelectronic properties. However, their high price compared to the commercialized Si-based solar cells and their low scalability are some drawbacks that must be overcome.
In this thesis, these drawbacks were surpassed by substituting the costly materials by low-cost alternatives. Instead of Spiro-OMeTAD [1] as the hole transport material (HTM), a much cheaper material, CuSCN was used [2]. Furthermore, all the fabrication processes were performed in air under ambient conditions, avoiding the high cost and scalability problems associated with the use of a glove box. Considering this philosophy of low-cost development of the PSCs, the active layer was composed by MAI and PbI2 as the precursors, which were dissolved in γ-Butyrolactone (GBL), while maintaining the TiO2 as the electron transport material (ETM). Incisive analysis of the individual layers of the solar cells were performed by many characterization tools such as spectrophotometry, XRD and SEM-EDS.
As a result of several optimizations, a solar cell with VOC, JSC, FF and PCE values of 0.86 V, 15.29 mA/cm2, 0.64 and 8.48%, respectively was fabricated surpassing the previous efficiency record of 6.35% obtained in previous works [3].
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Perovskite Solar Cells Low-Cost Photovoltaics CuSCN MAPbI3 Spin-Coating