Tuning Perovskite Morphology by Polymer Additive for High Efficiency Solar Cell
- 13 February 2015
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Applied Materials & Interfaces
- Vol. 7 (8), 4955-4961
- https://doi.org/10.1021/acsami.5b00052
Abstract
Solution processable planar heterojunction perovskite solar cell is a very promising new technology for low cost renewable energy. One of the most common cell structures is FTO/TiO2/CH3NH3PbI3-xClx/spiro-OMeTAD/Au. The main issues of this type of solar cell are the poor coverage and morphology control of the perovskite CH3NH3PbI3-xClx film on TiO2. For the first time, we demonstrate that the problems can be easily resolved by using a polymer additive in perovskite precursor solution during the film formation process. A 25% increase in power conversion efficiency at a value of 13.2% is achieved by adding 1 wt % of poly(ethylene glycol) in the perovskite layer using a 150 °C processed TiO2 nanoparticle layer. The morphology of this new perovskite was carefully studied by SEM, XRD, and AFM. The results reveal that the additive controls the size and aggregation of perovskite crystals and helps the formation of smooth film over TiO2 completely. Thus, the Voc and Jsc are greatly increased for a high efficiency solar cell. The amount of additive is optimized at 1 wt % due to its insulating characteristics. This research provides a facile way to fabricate a high efficiency perovskite solar cell by the low temperature solution process (2 compact layer device.Keywords
Funding Information
- Ministry of Science and Technology, Taiwan (MOST 103-3113-E-002-011)
This publication has 24 references indexed in Scilit:
- Organohalide lead perovskites for photovoltaic applicationsEnergy & Environmental Science, 2014
- Organometallic Halide Perovskites: Sharp Optical Absorption Edge and Its Relation to Photovoltaic PerformanceThe Journal of Physical Chemistry Letters, 2014
- Efficiency Enhancement of Perovskite Solar Cells through Fast Electron Extraction: The Role of Graphene Quantum DotsJournal of the American Chemical Society, 2014
- Formamidinium lead trihalide: a broadly tunable perovskite for efficient planar heterojunction solar cellsEnergy & Environmental Science, 2014
- Efficient Inorganic–Organic Hybrid Perovskite Solar Cells Based on Pyrene Arylamine Derivatives as Hole-Transporting MaterialsJournal of the American Chemical Society, 2013
- Electron-Hole Diffusion Lengths Exceeding 1 Micrometer in an Organometal Trihalide Perovskite AbsorberScience, 2013
- Sequential deposition as a route to high-performance perovskite-sensitized solar cellsNature, 2013
- Lead Iodide Perovskite Sensitized All-Solid-State Submicron Thin Film Mesoscopic Solar Cell with Efficiency Exceeding 9%Scientific Reports, 2012
- Organometal Halide Perovskites as Visible-Light Sensitizers for Photovoltaic CellsJournal of the American Chemical Society, 2009
- Organic-Inorganic Hybrid Materials as Semiconducting Channels in Thin-Film Field-Effect TransistorsScience, 1999