Journal
ACS PHOTONICS
Volume 2, Issue 5, Pages 589-594Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ph500255t
Keywords
CH3NH3PbI3; recombination; emission lifetime; hybrid photovoltaics
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Funding
- Swedish Energy Agency
- Swedish Research Council (VR)
- Goran Gustafsson Foundation
- STand-UP for Energy program
- Knut and Alice Wallenberg Foundation
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CH3NH3PbI3 perovskite solar cells have rapidly risen to the forefront of emerging photovoltaic technologies. A solution-based, two-step method was reported to enhance the reproducibility of these solar cells. In this method, first a coating of PbI2 is applied by spin-coating onto a TiO2-coated substrate, followed by a dip in a methylammonium iodide solution, leading to conversion to CH3NH3PbI3. The concentration of PbI2 in the spin-coating solution is a very important factor that affects the infiltration of the perovskite and the amount deposited. The best solar cell performance of 13.9% was obtained by devices prepared using 1.0 M of PbI2 in dimethylformamide. These devices also had the longest electron lifetime and shortest carrier transport time, yielding lowest recombination losses. Rapid quenching of the perovskite emission is found in device-like structures, suggesting reasonably good efficient carrier extraction at the TiO2 interface and quantitative extraction at the spiro-OMeTAD interface.
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