Hole-conductor-free perovskite solar cells with carbon counter electrodes based on ZnO nanorod arrays
文献情報
B. X. Wang, T. F. Liu, Y. B. Zhou, X. Chen, X. B. Yuan, Y. Y. Yang, W. P. Liu, J. M. Wang, H. W. Han, Y. W. Tang
A one dimensional nanostructure array has been considered as a successful charge transport material for perovskite solar cells (PSCs), because of its large internal surface area, superior charge collection efficiency and fast charge transport. Herein we demonstrate a ZnO nanorod (NR) array as the electron collector in a hole-conductor-free PSC with a carbon counter electrode (CE). A relatively low initial power conversion efficiency (PCE) of 5.6% was achieved using a 1 μm long ZnO NR array as an electron collector. However, by introduction of a thin TiO2 coating layer on the surface of ZnO via TiCl4 treatment, the PCE of the cell has been improved to the highest value of 8.24%. It is revealed that the performance enhancement of the ZnO/TiO2 NR based PSCs is largely attributed to the larger surface area, reduced electron combination, and superior electron transport properties.
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