Perovskite single-crystal solar cells with all-backside electrodes

Erik Garnett^a, Parisa Khoram^a, Sarah Brittman^a

^aCenter for Nanophotonics, AMOLF, The Netherlands, Science Park, 104, Amsterdam, Netherlands

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, Parisa Khoram, 337
Publication date: 5th February 2015

Hybrid organolead trihalide perovskite (CH₃NH₃PbX₃) solar cells are typically made in multilayer structures, in which the perovskite thin film is sandwiched between charge-transport layers and electrodes. The perovskite is deposited either as film alone or on top of and infiltrated into a mesoporous scaffold. To date, perovskite solar cells have achieved efficiencies beyond 20% [1] and some of their main properties, such as charge carrier type, diffusion length and life time, have been measured qualitatively and quantitatively. However it is uncertain whether these measurements reflect intrinsic materials properties or are influenced by the deposition methods and morphology of the film. In this work, instead of using a conventional planar structure, we fabricate perovskite single-crystal solar cells with both electrodes on the backside of the crystals. We use two different metallic electrodes bridged by individual CH₃NH₃PbBr₃ perovskite single crystals to extract both types of carriers from the backside of the cell. If implemented on a large scale, this geometry has the potential to reduce optical shading and resistive losses. An additional benefit is that both contacts and charge-transport layers can be deposited on the substrate before deposition of the perovskite, which means that standard high-temperature, plasma-assisted, or aqueous processes can be used that would normally damage the perovskite. Furthermore, placing perovskite crystals on top of the electrodes makes it possible to investigate the exposed electrode/perovskite interfaces with spatial and chemical resolution. We have investigated electrical as well as photovoltaic properties of these devices. Photocurrent and photovoltage were observed in the individual perovskite single crystals, indicating that this back-electrode geometry might be suitable for high-efficiency perovskite photovoltaics.

Jeon, N. J., Noh, J. H., Yang, W. S., Kim, Y. C., Ryu, S., Seo, J., & Seok, S. I. (2015). Compositional engineering of perovskite materials for high-performance solar cells. Nature, 517(7535), 476-480.

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