| Abstract |
| The photovoltaic properties of TiO2/ZrO2 double electron transport layered perovskite solar cells were investigated based on the ZrO2 layer thickness. Samples were fabricated with a glass/FTO/TiO2/ZrO2/ perovskite structure. The TiO2/ZrO2 layer thickness ratio was confirmed to be 264/0, 228/168, 228/204, 270/ 242, and 282/288 nm, respectively, using an electron probe microanalyzer. To analyze the photovoltaic characteristics and transmittance of the ZrO2 layer of the PSCs according to the ZrO2 layer thickness, a solar simulator, incident photon-to-current conversion efficiency, and ultraviolet-visible-near-infrared spectroscopy were used, respectively. A field emission scanning electron microscopy and atomic force microscopy were used to analyze the microstructure of the ZrO2 and perovskite layers. As the ZrO2 layer thickness increased, the energy conversion efficiency (ECE) increased initially, reached a maximum ECE of 14.24% at 204 nm ZrO2, and then decreased thereafter. The increase in ECE was due to the enhanced electrical conductivity of the ZrO2, while the decrease was attributed to the reduced transmittance as the thickness of the ZrO2 increased. In addition, we confirmed that the surface valley spacing in the ZrO2 layer might affect the grain size and thickness of the perovskite layers, influencing the ECE.
(Received November 1, 2019; Accepted December 4, 2019) |
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| Key Words |
| electron transport layer, ZrO2 layer, perovskite grain, perovskite solar cells |
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