Electron extraction mechanism in low hysteresis perovskite solar cells using single crystal TiO2 nanorods
| Autor: | Gill Sang Han, Fangda Yu, Yen Jung Tu, Hee Suk Roh, Jung-Kun Lee |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment business.industry Nanoparticle 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure 01 natural sciences 0104 chemical sciences Ion Hysteresis Optoelectronics General Materials Science Nanorod 0210 nano-technology business Mesoporous material Single crystal Perovskite (structure) |
| Zdroj: | Solar Energy. 167:251-257 |
| ISSN: | 0038-092X |
| DOI: | 10.1016/j.solener.2018.04.009 |
| Popis: | This study compares the photovoltaic performance of perovskite solar cells PSCs which use different types of TiO2 mesoporous scaffold; nanoparticle (NP) film and nanorod (NR) array. In PSCs of TiO2 NRs, the hysteresis of current density–voltage (J-V) curves is reduced significantly. The hysteresis index of PSCs of 670 nm long NRs is only 0.014. A difference in the charge accumulation at the TiO2-perovskite interface and the trapping site density is responsible for the smaller hysteresis of PSCs of TiO2 NRs. In PSCs of TiO2 NRs, mobile ions migrate longer and less electrons are trapped on the surface of TiO2 NRs. This leads to a unique columnar space charge polarization at the TiO2-perovskite interface, which facilitates electron extraction and suppresses the hysteresis of J-V curve. Our study shows a new way to design the microstructure of the mesoporous TiO2 layer for hysteresis-free high performance perovskite solar cells. |
| Databáze: | OpenAIRE |
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