1, Skoltech, Moscow, , Russian Federation
The emerging perovskite solar cells have demonstrated impressive power conversion efficiencies exceeding 22%, while their practical application is restricted mainly by poor operation stability. We have reported recently that hybrid MAPbX3 (X=I, Br, I+Br, I+Cl) perovskites undergo facile thermal and photochemical degradation even under anoxic conditions without exposure to oxygen and moisture, while their all-inorganic counterparts CsPbX3 proved to be significantly more stable .
Here we will discuss our the most recent results coming from a systematic study of the intrinsic stability of a broad range of materials represented by various lead-based perovskites as well as lead-free complex halides of tin, germanium, bismuth and antimony. The revealed pathways of thermal, photochemical and electrochemical degradation processes will be presented and a conclusion on the potential of different groups of materials for practical application in PV technology will be drawn.
We will also analyze the interface degradation effects occurring between the electrodes, charge transport layer materials and the photoactive layer induced by electric field, elevated temperatures, solar light or a combination of these stress factors [2-3]. Finally, it will be shown that reaching any commercially interesting operation lifetimes for perovskite solar cells requires a considerable shift from the currently used device design paradigms as well as a comprehensive multiparametric optimization of all used materials and functional components.
1. A. F. Akbulatov, K. J. Stevenson, P. A. Troshin et al., J. Phys. Chem. Lett. 2017, 8, 1211
2. S.Yu. Luchkin, P. A. Troshin, K. J. Stevenson et al., ACS App. Mater. Interfaces 2017, 9, 33478
3. A. F. Akbulatov, K. J. Stevenson, P. A. Troshin et al., Adv. Energ. Mater. 2017, 7, 1700476