Approach to improve stability of perovskite solar cells

Eurig Jones^a, Leo Furnell^a, Arthur Connell^a, Peter Holliman^a, Sanjay Ghosh^a

^aBangor University, School of Chemistry, United Kingdom, Bangor LL57 2UW, Reino Unido, United Kingdom

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, Sanjay Ghosh, 432
Publication date: 5th February 2015

Hybrid perovskite of the form (MA)PdX₃ (MA = CH₃NH₃⁺, X = Cl, Br or I) are found to be excellent absorber materials for solar cells. Snaith et al. have recently reported the first solid-state perovskite solar cell [1]. This technology has subsequently shown remarkable improvements in photo-conversion efficiencies (PCE) in just a few years, which is now giving nearly 20%. While the progress in device efficiencies has been great, there are two main drawbacks associated with perovskite solar cells. One is the potential toxicity of lead in the absorber material and another is the instability of organo-metal perovskites in air. Recently, it has been demonstrated that replacing toxic element lead by tin to form perovskite could give PCE up to 6% [2]. It has also been reported by Karunadasa et al. that layered hybrid perovskite solar absorber show enhanced moisture stability [3]. For commercial application, long-term stability of perovskite solar cell is clearly highly desirable. Here, we present our recent studies into using different aryl/alkyl ammonium halide to form layered perovskites and using them as additives to improve perovskite stability. Device characterization and performance will also be described and these data interpreted in the context of enhancing device lifetimes.
Fig. 1 (Left) A perovskite film deposited on glass and (right) perovskite films deposited on TiO2
1. Lee, M.M.; Teuscher, J.; Miyasaka, T.; Murakami, T.N. ; Snaith, H. J. Efficient Hybrid Solar Cells Based on Meso-Superstructured Organometal Halide Perovskites. Science 2012, 338, 643-647. 2. Noel, N. K.; Stranks, S.D; Abate, A.; Wehrenfennig, C.; Guarnera, S.; Haghighirad, A-A.; Sadhanala, A.; Sadhanala, Eperon, G.E.; Pathak, S.K.; Johnston, M.B.; Petrozza, A; Herz, L.M.; Snaith, H.J. Lead-Free Organic-Inorganic Tin Halide Perovskites for Photovoltaic Applications. Energy Environ. Sci. 2014, 7, 3061-3068. 3. Smith, I.C.; Hoke, E.T.; Solis-Ibarra, D.; McGehee , M.D.; Karunadasa , H. I. Perovskite Solar Cells A Layered Hybrid Perovskite Solar-Cell Absorber with Enhanced Moisture Stability. Angew. Chem. Int. Edi. 2014, 53, 11232-11235.

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