Highly efficient and stable perovskite solar cells via modified carbon back contact
Somayyeh Gholipour a, Parnian Ferdowsi a, Michael Saliba a
a University of Fribourg, Adolphe Merkle Institute, Chemin des Verdiers, 4, Fribourg, Switzerland
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2020 May 12th - 14th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Poster, Somayyeh Gholipour, 220
Publication date: 6th February 2020

Perovskite solar cells (PSCs) have rapidly emerged as a potential competitive photovoltaic technology reaching high power conversion efficiencies (PCEs)to a certified value of 23.7% within ten years. At this stage, the key issue is to improve long-term stability [1]. A promising direction toward improving perovskite phase stability is compositional engineering[2]. Thus, using lower amount of volatile methylammonium (MA) and more formamidinium (FA) can increase thermal stability. Lower Br/I ratios inhibits the disproportionate blue-shift of the bandgap [3]. In this work,by using the optimized perovskite composition and carbon cloth as a back contact, high PCE of 15% has been demonstrated where devices retain 60% of the initial PCE after 180 hours under 85 ºC and 40% relative humidity (RH) without any encapsulation and light soaking. The gold counterparts suffered from rapid degradation and retained 45% of the initial PCE at the same condition. In addition, the long term device stability of carbon based devices with different hole transporter material (HTM) revealed that poly[bis(4‐phenyl)(2,4,6‐trimethylphenyl)amine] (PTAA) is thermally more stable HTM than the copper thiocyanate (CuSCN) inorganic HTM (60% to 51%).

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