Unraveling the Effect of PbI2 Concentration on Charge Recombination Kinetics in Perovskite Solar Cells
2015 (English)In: ACS PHOTONICS, ISSN 2330-4022, Vol. 2, no 5, 589-594 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2015. Vol. 2, no 5, 589-594 p.
CH3NH3PbI3, recombination, emission lifetime, hybrid photovoltaics
IdentifiersURN: urn:nbn:se:uu:diva-256848DOI: 10.1021/ph500255tISI: 000355066900005OAI: oai:DiVA.org:uu-256848DiVA: diva2:827122