Photovoltaic effect of TiO2 thick films with an ultrathin BiFeO3 as buffer layer |
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| Authors: | Fen Wu Linyu Song Yiping Guo Song Jin Enbing Bi Han Chen Huanan Duan Hua Li Hezhou Liu Hongmei Kang |
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| Affiliation: | 1. State Key Laboratory of MMCs, School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai, 200240, China
2. Shanghai Aerospace System Engineering Institute, Shanghai, 201109, China
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| Abstract: | The photovoltaic (PV) effect of a bilayer anatase TiO2/BiFeO3 (BFO) film has been studied. The 20-nm ultrathin BFO layers were deposited on the fluorine-doped tin oxide (FTO) glass substrates by the chemical solution deposition method. An anatase TiO2 layer is deposited subsequently on the BFO surface via a screen-printing technique. It is found that the FTO/TiO2/Au cell exhibits negligible PV effect under solar exposure, while the one after introducing an ultrathin BFO film between TiO2 and FTO leads to a considerable PV effect with an open-circuit voltage of ?0.58 V and a photocurrent density of 18.27 µA/cm2. The FTO/BiVO4 (BVO)/TiO2/Au cell was constructed to investigate the underlying mechanism for the observed effect. A negligible PV effect of the FTO/BVO/TiO2/Au cell indicates that the PV effect of the FTO/BFO/TiO2/Au cell arises mainly from a built-in electric field in the BFO film induced by the self-polarization. Our work opens up a new path to utilize TiO2 and may influence the future design of solar cells. |
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