Prospects of chemical and operational stability for perovskite solar cells.

Juarez-Perez , Emilio J.
3rd Sino-Spanish Research and Innovation Forum
Participation type: 
Ponencia plenaria e invitada
Universidad de Zaragoza (Spain)

Hybrid lead halide based perovskites have emerged as promising active materials for photovoltaic cells.
Over the past decade, enormous efforts have been devoted to device fabrication and optimization
leading to power conversion efficiencies exceeding 25%, which gives perovskite solar cells the
competitive advantage over many other well-known solar photovoltaic technologies. Despite superb
efficiencies achieved in laboratory-scale devices, it was soon recognized that long-term stability of
this material was rapidly compromised under ambient conditions and such instability could jeopardize
the commercial prospects of perovskite solar cells.
In this talk, current strategies to overcome the long-term instability problem are outlined including
discussion between the thin line separating 1) photo- and thermal degradation processes, 2) true
chemical decomposition reactions versus evaporation-like processes, 3) the halide effect on stability
in terms of energy barriers during degradation reactions and 4) clear distinction between intrinsic
stability of the active material and the expected operational stability of the device. In summary, a
balanced assessment of this multifaceted problem to give us a positive perspective for the commercial
future of this technology.