Performance Deterioration and Stability issues with Organic-inorganic hybrid and All-inorganic Perovskite Solar Cells
Ajay Jena a, Tsutomu Miyasaka a
a Graduate School of Engineering, Toin University of Yokohama, 1614, Kurogane-cho, Aoba, Yokohama, Kanagawa, Japan 225-8503
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Oral, Ajay Jena, presentation 094
Publication date: 11th February 2019

Despite an expeditious rise in its power coversion efficiency organolead halide perovskite solar cells (PSCs) still stand way behind commercialization because of two major challenges; poor stability and high toxicity of Pb. In a recent study on thermal stability of regular MAPbI3 solar cells, we found that spiro-OMeTAD (used as hole transporting material) plays a notorious role in performance deterioration of the cells at elevated temperatures. It seems that, not the degradation of perovskite (MAPbI3) but some physical/chemical alteration at the perovskite/spiro-OMeTAD interface is a more serious cause of performance degradation in the MAPbI3 cells. Recovery of performance after recycling the degraded device by replacing with a fresh HTM layer depends on composition of perovskite, indicating loss of organic cation being involved in the process. As organic part of hybrid perovskites is believed to be responsible for poor thermal stability of these materials, all-inorganic CsPbX3 perovskites are gaining much interest these days. However, the challenge in CsPbI3 perovskties is the stabilization of its photoactive black phase under ambient conditions (at room temperature) because the balck phase is formed only at temperature above 300 oC. We have found that Eu (Eu2+ or Eu3+) inclusion into CsPbI3 precursor solution can form the black phase at ambient conditions (85 oC). Remarkable reduction of crystal/grain size possibly results in formation of the high symmetry cubic phase (α-CsPbI3). The devices made from such Eu-stabilized photoactive CsPbI3 (CsPbI3:xEu) perovskites demonstrate a power conversion efficiency of around 7% at best conditions. Nevertheless, there are number of challenges in improving the long term stability of the photoactive phase of these all-inorganic perovksites. These issues and possible ways to address them will be discussed.

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