Proceedings of Online nanoGe Fall Meeting 20 (OnlineNFM20)
Publication date: 4th October 2020
Recently, various organometallic framework materials (MOFs) have been employed in optoelectronic devices due to the unique properties of MOF materials that result in improved performance and stability. In this work, NH2-MIL-101 (Fe) and NH2-MIL-125 (Ti) MOFs are applied as electron transport layers in perovskite solar cells (CH3NH3PbI3, MAPI). Crystal structures were confirmed by X-ray powder diffraction and morphology was examined using scanning electron microscopy (SEM). We measured specific surface areas of 2563.66m2/g for the sample (Fe) and 602.37m2/g for the sample (Ti) using the Brunauer-Emmett-Teller theory (BET). obtaining in this way a microporous material (Fe) and another mesoporous (Ti). Films were obtained by spin coating and liquid epitaxy deposition techniques, and thickness, roughness, and crystalline domains were getting with an atomic force microscope (AFM). UV-vis spectroscopy showed the absorption of MOF films with the tauc approximation, a band gap energy of 2.66 eV and 2.13 eV for (Fe) and (Ti) respectively. Both materials were used as an electron transport layer in perovskite solar cells, optimizing MOF thickness for higher energy conversion efficiencies of 4.1% and 5.9% for devices containing MOFs (Fe) and (Ti) respectively, what constitutes a breakthrough for these materials applied to solar cells.
metal-organic frameworks, electron transporting layers, perovskite solar cells, liquid epitaxy, spin coating.
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