Electron Injection in Mesoporous TiO2 Layer in CH3NH3PbI3Perovskite Solar cell Evidenced by Admixing TiO2with Al2O3 Nanocrystals

Nam-Gyu Park^a, Jin-Wook Lee ^a, Jae-Min Cha^a

^aSungkyunkwan University, South Korea, 300 Cheoncheon-dong, Jangan-gu, Suwon, 440, Korea, Republic of

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Jae-Min Cha, 444
Publication date: 5th February 2015

Photovoltaic performance of mesoscopic CH3NH3PbI3 perovskite solar cellsbased on porous layer composed of TiO2, Al2O3 and their mixture was investigated. Composition of porous layer was controlled by varying mixing ratio of precursor solutions containing TiO2paste (0.15 g/ml in ethanol) andAl2O3 colloidal dispersion(5.71 wt% in 2-propanol). Composition of porous layer was determined by EDS mapping, in which mixing ratio (TiO2 precursor: Al2O3 precursor) of 3:1, 1:1 and 1:3 results in atomic ratio (TiO2:Al2O3) of 1.32:0.76, 0.88:1.52 and 0.44:2.28. CH3NH3PbI3 was deposited on porous layer using two-step method while spiro-MeOTAD was used as a hole transporting material. As the atomic ratio of Al2O3 in porous layer is increased, average short-circuit current density (JSC) is gradually decreased from 19.02 mA/cm2(pure TiO2) to 7.72 mA/cm2 (pure Al2O3) whereas open-circuit voltage (VOC) is gradually increased from 0.93 V to 1.05 V. Increased photoluminescence intensity with increased Al2O3 content confirms that decreased JSC is due to lower charge separationand/or collection efficiency. Transient photocurrent measurement confirms that charge collection time constant (?C) is decreased from 3.01�10-5 s to 6.10�10-6 s as the Al2O3 content is increased, which is indicative of increased portion of electron transport through perovskite itself. Increased VOC with increased Al2O3 content is due to higher potential energy of electrons transporting through perovskite compared to that of electrons injected to TiO2, resulting in higher Fermi level of the system.

Jae-MinCha, Jin-Wook Lee, Nam-Gyu Park* School of Chemical Engineering and Department of Energy Science, Sungkyunkwan University, Suwon 440-746, Korea

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