Efficient hysteresis-less bilayer type CH3NH3PbI3 perovskite hybrid solar cells. (30th November 2015)

• Record Type: Journal Article
• Authors: Park, Jin Kyoung; Heo, Jin Hyuck; Han, Hye Ji; Lee, Min Ho; Song, Dae Ho; You, Myoung Sang; Sung, Shi-Joon; Kim, Dae-Hwan; Im, Sang Hyuk
• Is Part Of: Nanotechnology. Volume 27:Number 2(2016)
• Publication Date: 2015-11-30
• Subjects: perovskite solar cells -- bilayer -- mesoscopic TiO2 -- hysteresis; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/0957-4484/27/2/024004
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: Bilayer type CH3 NH3 PbI3 (MAPbI3 ) perovskite hybrid solar cells were fabricated via a one-step spin-coating process by using solubility controlled MAPbI3 solutions of MAPbI3 –DMSO (dimethyl sulfoxide) and MAPbI3 –DMF (N, N-dimethylformamide)–HI. The best DMSO-bilayer device showed 1.07 ± 0.02 V V oc (open-circuit voltage), 20.2 ± 0.1 mA cm −2 J sc (short-circuit current density), 68 ± 2% FF (fill factor), and 15.2 ± 0.3% η (overall power conversion efficiency) under the forward scan direction and 1.07 ± 0.02 V V oc, 20.4 ± 0.1 mA cm −2 J sc, 70 ± 3% FF, and 15.9 ± 0.4% η under the reverse scan direction. The best HI-bilayer device had 1.08 ± 0.02 V V oc, 20.6 ± 0.1 mA cm −2 J sc, 75 ± 1% FF, and 17.2 ± 0.2% η under the forward scan direction and 1.08 ± 0.02 V V oc, 20.6 ± 0.1 mA cm −2 J sc, 76 ± 2% FF, and 17.4 ± 0.3% η under the reverse scan direction. The deviation of average device efficiency ( of 20 DMSO samples and 20 HI samples was 14.2 ± 0.95% and 16.2 ± 0.85%, respectively. Therefore, the HI-bilayer devices exhibited better device efficiency and smaller J – V (current density–voltage) hysteresis with respect to the scan direction than the DMSO-bilayer devices due to the reduced recombination and traps by the formation of a purer and larger MAPbI3 perovskite crystalline film.