Ambient air-processed mixed-ion perovskites for high-efficiency solar cells
2016 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 4, no 42, 16536-16545 p.Article in journal (Refereed) Published
Mixed-ion (FAPbI(3))(1-x)(MAPbBr(3))(x) perovskite solar cells have achieved power conversion efficiencies surpassing 20%. However, in order to obtain these high efficiencies the preparation is performed in a controlled inert atmosphere. Here, we report a procedure for manufacturing highly efficient solar cells with a mixed-ion perovskite in ambient atmosphere. By including a heating step at moderate temperatures of the mesoporous titanium dioxide substrates, and spin-coating the perovskite solution on the warm substrates in ambient air, a red intermediate phase is obtained. Annealing the red phase at 100 degrees C results in a uniform and crystalline perovskite film, whose thickness is dependent on the substrate temperature prior to spin-coating. The temperature was optimized between 20 and 100 degrees C and it was observed that 50 degrees C substrate temperature yielded the best solar cell performances. The average efficiency of the best device was 17.6%, accounting for current-voltage (I-V) measurement hysteresis, with 18.8% performance in the backward scan direction and 16.4% in the forward scan direction. Our results show that it is possible to manufacture high-efficiency mixed-ion perovskite solar cells under ambient conditions, which is relevant for large-scale and low-cost device manufacturing processing.
Place, publisher, year, edition, pages
2016. Vol. 4, no 42, 16536-16545 p.
IdentifiersURN: urn:nbn:se:uu:diva-310043DOI: 10.1039/c6ta06912fISI: 000387166900031OAI: oai:DiVA.org:uu-310043DiVA: diva2:1054742
FunderGöran Gustafsson Foundation for promotion of scientific research at Uppala University and Royal Institute of TechnologySwedish Energy AgencyÅForsk (Ångpanneföreningen's Foundation for Research and Development)Swedish Research Council FormasSwedish Research Council