Back-Contact Perovskite Solar Cells
Askhat N. Jumabekov a, Udo Bach a b, Xiongfeng Lin b
a CSIRO, Bayview Ave, Clayton, 3169, Australia
b Department of Materials Engineering, Monash University, Melbourne, Victoria, 3800, Australia
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
Oral, Udo Bach, presentation 056
Publication date: 7th November 2016

Back-contact concepts have originally been developed in the field of silicon solar cells, where their implementation has resulted in significant efficiency gains, compared to conventional contacting architectures. Charge collection in these devices is typically facilitated by a set of two interdigitated finger electrode arrays, co-located on the backside of the silicon wafer. In this work we use an analogue concept to construct back-contact perovskite solar cells (bc-PSCs). The main advantage of back-contact concepts is that optical transmission losses arising from the top charge collection electrode can be avoided. In PSCs these losses typically occur in the thin conducting oxide (TCO) layer of the substrate used for their assembly. Here we present a novel quasi-interdigitated electrode design, which has not previously been applied to photovoltaic devices. We use this to fabricate the first reported bc-DSCs with charge selective collection electrodes. Characterization of our bc-PSCs with confocal photoluminescence and photocurrent mapping techniques reveals that the photocurrent collection efficiency is most efficient in areas that are in close vicinity to both, the electron and hole collecting electrodes. This suggests that further efficiency improvements can be expected by reducing the typical feature size of the array (pitch) below the 2 microns used for this study. Furthermore we will present a novel strategy to fabricate bc-PSCs based on interdigitated metal electrodes by selectively introducing ultra-thin work-function modifying layers to both electrodes prior to the deposiiton of perovskite. 


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