Detail Analysis on Temperature Effects of NiO Electron Conducting Layer for Perovskite Solar Cells
Seigo Ito a, Shota Fukumoto a, Ajay Baranwal a, Hiroyuki Kanda a, Nirmal Peiris, Hiroshi Segawa b, Takumi Kinoshita b, Yuichi Haruyama c, Tamotsu Miyasaka d
a Department of Materials and Synchrotron Radiation Engineering, Graduate School of Engineering, University of Hyogo
b Laboratory of Advanced Science and Technology for Industry, University of Hyogo
c Toin University of Yokohama, 1614 Kurogane-cho, Aoba, Yokohama, 2258503, Japan
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Yokohama-shi, Japan, 2017 February 2nd - 4th
Organizers: Tsutomu Miyasaka and Iván Mora-Seró
Poster, Shota Fukumoto, 006
Publication date: 7th November 2016

Organic-inorganic perovskite (PVK/ CH3NH3PbI3) type solar cells have attracted much attention due to its rapid improvement in the photo conversion efficiency. Recently, these kind of solar cells have achieved over 22% of photo conversion efficiency. However, most commonly employed organic hole transport materials (HTM) such as Spiro-OMeTAD increase the production cost and hinders the large scale industrial production of these type of solar cells. With the advent of further research, finding low cost alternatives to replace these expensive HTM is a major field of research. NiO was investigated as a low cost HTM, having a higher potential to replace expensive and popular spiro-OMeTAD. Herein we report, inverted PVK solar cell with the configuration of FTO glass/NiO/Perovskite/PC61BM/BCP/Ag. NiO was deposited on FTO glass by spray pyrolysis using nickel acetyl acetonate as a precursor solution. Perovskite layer was formed by one step deposition process by spin coating 1.8M solution of CH3NH3PbI3-DMF complex in DMSO. During the spin coating, toluene dripping was conducted inside a N2 filled glove box to get smooth PVK layer. The device possesses an appreciated power conversion efficiency (PCE) of 16.1% under simulated solar irradiation with fill factor (FF) of 0.76, short –circuit current density (Jsc) of 19.60 mA·cm-2, and open circuit voltage (Voc) of 1.08 V, which had been changed with the processing temperature at spray-pyrolysis deposition. We measured the NiO characteristics with the different processing temperatures (UV-Vis, EDX, XRD, XPS, XASF, and work function) for the further consideration. 

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