The Interface between FTO and the TiO2 Compact Layer Can Be One of the Origins to Hysteresis in Planar Heterojunction Perovskite Solar Cells
- 23 April 2015
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Applied Materials & Interfaces
- Vol. 7 (18), 9817-9823
- https://doi.org/10.1021/acsami.5b01789
Abstract
Organometal halide perovskite solar cells have shown rapid rise in power conversion efficiency, and therefore, they have gained enormous attention in the past few years. However, hysteretic photovoltaic characteristics, found in these solid-state devices, have been a major problem. Although it is being proposed that the ferroelectric property of perovskite causes hysteresis in the device, we observed hysteresis in a device made of nonferroelectric PbI2 as a light absorber. This result evidently supports the fact that ferroelectric property cannot be the sole reason for hysteresis. The present study investigates the roles of some key interfaces in a planar heterojunction perovskite (CH3NH3PbI3–xClx) solar cell that can potentially cause hysteresis. The results confirm that the interface between fluorine doped tin oxide (FTO) substrate and the TiO2 compact layer has a definite contribution to hysteresis. Although this interface is one of the origins to hysteresis, we think that other interfaces, especially the interface of the TiO2 compact layer with perovskite, can also play major roles. Nevertheless, the results indicate that hysteresis in such devices can be reduced/eliminated by changing the interlayer between FTO and perovskite.Keywords
Funding Information
- Japan Science and Technology Agency
This publication has 23 references indexed in Scilit:
- Bringing solar cell efficiencies into the lightNature Nanotechnology, 2014
- Solar cell woesNature Photonics, 2014
- Perovskite feverNature Materials, 2014
- Interface engineering of highly efficient perovskite solar cellsScience, 2014
- Charge-carrier dynamics in vapour-deposited films of the organolead halide perovskite CH3NH3PbI3−xClxEnergy & Environmental Science, 2014
- Anomalous Hysteresis in Perovskite Solar CellsThe Journal of Physical Chemistry Letters, 2014
- Perovskites: The Emergence of a New Era for Low-Cost, High-Efficiency Solar CellsThe Journal of Physical Chemistry Letters, 2013
- Efficient planar heterojunction perovskite solar cells by vapour depositionNature, 2013
- Efficient Hybrid Solar Cells Based on Meso-Superstructured Organometal Halide PerovskitesScience, 2012
- Organometal Halide Perovskites as Visible-Light Sensitizers for Photovoltaic CellsJournal of the American Chemical Society, 2009