Zn2SnO4-Based Photoelectrodes for Organolead Halide Perovskite Solar Cells
- Zn2SnO4-Based Photoelectrodes for Organolead Halide Perovskite Solar Cells
- 오이슬; 김동회; 이진아; 신성식; 이진욱; 박익재; 고민재; 박남규; 표성규; 홍국선; 김진영
- perovskite; Zn2SnO4; solar cell
- Issue Date
- The Journal of Physical Chemistry C
- VOL 118, NO 40, 22991-22994
- We report a new ternary Zn2SnO4 (ZSO) electron-transporting electrode of a CH3NH3PbI3 perovskite solar cell as an alternative to the conventional TiO2 electrode. The ZSO-based perovskite solar cells have been prepared following a conventional procedure known as a sequential (or two-step) process with ZSO compact/mesoscopic layers instead of the conventional TiO2 counterparts, and their solar cell properties have been investigated as a function of the thickness of either the ZSO compact layer or the ZSO mesoscopic layer. The presence of the ZSO compact layer has a negligible influence on the transmittance of the incident light regardless of its thickness, whereas the thickest compact layer blocks the back-electron transfer most efficiently. The open-circuit voltage and fill factor increase with the increasing thickness of the mesoscopic ZSO layer, whereas the short-circuit current density decreases with the increasing thickness except for the thinnest one (∼100 nm). As a result, the device with a 300 nm-thick mesoscopic ZSO layer shows the highest conversion efficiency of 7%. In addition, time-resolved and frequency-resolved measurements reveal that the ZSO-based perovskite solar cell exhibits faster electron transport (∼10 times) and superior charge-collection capability compared to the TiO2-based counterpart with similar thickness and conversion efficiency.
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