Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
The electronic structure of the perovskite from different preparation method and high efficient perovskite solar cell based on different hole conductors and metal oxide
Dongqin Bi, Gerrit Boschloo, Rebecka Lindblad, Erik M. J. Johansson, Anders Hagfeldt
The electronic structure and chemical composition of efficient CH3NH3PbI3perovskite solar cell materials deposited onto mesoporous TiO2 were studied using photo-electron spectroscopy with hard X-rays. The measurements of the valence levels were in good agreement to simulated density of states (DOS) and the investigation gives information on the character of the valence level. We also show that two different deposition techniques give results indicating similar electronic structures. We report on solid-state mesoscopic heterojunction solar cells employing (CH3NH3)PbI3 perovskite as light harvester, using Spiro-OMeTAD, P3HT, DEH as hole transport materials, HTMs respectively. Among the three hole conductors HTMs, Spiro-OMeTAD result in devices shows the best with the highest light to electricity power conversion. The charge transport was rather similar for the different devices, and the difference in lifetime can therefore explain the lower efficiency of the devices based on P3HT and DEH HTMs. We use perovskite (CH3NH3PbI3) with a better compatibility with ZnO nanorod arrays(NRAs) and with a higher absorption coefficient than the dye molecules, as sensitizer for ZnO NRAs solar cells. We achieve a best efficiency of 5.0%. The better performance of perovskite solar cell compared to solid-state dye-sensitized solar cells (ssDSCs) mainly comes from the enhanced absorption. Furthermore, the dynamic electron transfer results show that a similar charge transfer process in ZnONRAs/CH3NH3PbI3 solar as that in DSCs. A two-step deposition technique is used for preparing CH3NH3PbI3 perovskite solar cells using insulating metal oxide, and the dynamic charge transport is also investigated.
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