Charge Transfer and Interface Chemistry at NiO/Organometallic Perovskite Heterojunction

Peter Chen^a, Tzung-Fang Guo^a, Po-Shen Shen^a, Ming-Hsien Li^a, Ming-Wei Lin^b, Yao-Jane Hsu^b, Carlito S. Ponseca^c

^aDept. Photonics, National Cheng Kung University, No. 1, University Rd., Tainan, 701

^bNational Synchrotron Radiation Research Center (NSRRC)

^cLund University, Department of Chemical Physics, Getingevägen 60, Lund, 22241, Sweden

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, Peter Chen, 093
Publication date: 5th February 2015

Organic-inorganic hybridmetal halide perovskite solar cells are promising low-cost emerging photovoltaic devices. In this presentation, we review recent published works of perovskite-based solar cells incorporated with inorganic p-type NiO as hole extraction layer. The current state-of-the-art devices of nickel oxide-based perovskite solar cells display a remarkably power conversion efficiency over 15%. The carrier transfer and transport phenomena are investigated by ultrafast transient absorption and terahertz spectroscopy. The THz photoconductivity kinetics of MAPbI3 in contact with NiO nanocystals or /NiOx sputtered thin film will be discussed. The mobility is intensity independent in the early timescale (within few ps as shown in Figure 1.) which implies that there is no other faster process, such as geminate recombination, competing with charge generation. Intensity dependent decay was found in some samples showing that non-linear recombination processes may occur in the materials. The interfacial chemical environment is characterized by X-ray photoelectron spectroscopy (XPS). We found some evidences for the formation of PbO and Ni at the interface between CH₃NH₃PbI₃and NiO. Development of high quality and chemical stable host material will be crucial for this type of solar cells. Our works elucidates the fundamental mechanism on the carrier kinetics and material chemistry at the interfaces of this photovoltaic junction and provides better understanding on the functionality of this type of solar cell. The replacement of organic hole transport materials by metal oxide is advantageous for providing robust device architecture and the development of fully inorganic perovskite-based thin film solar cells or tandem cells.
Figure 1. THz photoconductivity kinetics MAPbI3/NiOx thin film for the first 20ps.
1.Kim, J. H.; Liang, P.-W.; Williams, S. T.; Cho, N.; Chueh,C.-C.; Glaz,M. S.; Ginger D. S. and Jen, A. K.-Y. Adv. Mater. , 2014, DOI: 10.1002/adma.201404189. 2.Wang, K.-C.; Shen,P.-S.; Li, M.-H.; Chen, S.; Lin, M.-W.; Chen, P. and Guo, T.-F. ACS Appl. Mater. Interfaces, 2014, 6, 11851-11858. 3.Wang,K.-C.; Jeng,J.-Y.; Shen,P.-S.; Chang, Y.-C.; Diau, E. W.-G.; Tsai,C.-H.; Chao,T.-Y.; Hsu,H.-C.; Lin, P.-Y. Chen, P.; Guo T.-F. and Wen,T.-C.; Sci. Rep., 2014, 4, 4756

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