Null current hysteresis for acetylacetonate electron extraction layer in perovskite solar cells.
Solution processed zirconium acetylacetonate (Zr(acac)) is successfully employed as an electron extraction layer, replacing conventional titanium oxide, in planar CH3NH3PbI3 perovskite solar cells. The as-prepared Zr(acac) film possesses high transparency, high conductivity, a smooth morphology, high wettability, compatibility with PbI2 DMF solution, and an energy level matching that of CH3NH3PbI3 perovskite material. An average power conversion efficiency of about 11.93%, along with a high fill factor of 74.36%, an open circuit voltage of 1.03 V, and a short-circuit current density of 15.58 mA cm(-2) is achieved. The overall performance of the devices is slight better than that of cells using ruthenium acetylacetonate (Ru(acac)). The differences between solar cells with different electron extraction layers in charge recombination, charge transport and transfer and lifetime are further explored and it is demonstrate that Zr(acac) is a more effective and promising electron extraction layer. This work provides a simple, and cost effective route for the preparation of an effective hole extraction layer.
Advanced Display Research Centre, Department of Information Display, Kyung Hee University, Dongdaemoon-gu, Seoul 130-701, Korea. jjang@khu.ac.kr.
Abd Rashid
AR
Bin Mohd Yusoff
Solar Energy Research Institute, Universiti Kebangsaan Malaysi, a43600 Bangi, Selangor, Malaysia. asri@ukm.edu.my.
Mohd Asri Mat
MA
Teridi
Advanced Display Research Centre, Department of Information Display, Kyung Hee University, Dongdaemoon-gu, Seoul 130-701, Korea. jjang@khu.ac.kr.
Jin
J
Jang