报告时间：2016年11月10日下午14:30
报告地点：科技创新大楼B113室
报告题目：Towards understanding the main degradation pathway of hybrid and all-inorganic perovskite absorbers under the realistic solar cell operation conditions

Towards understanding the main degradation pathway of hybrid and all-inorganic perovskite absorbers under the realistic solar cell operation conditions

Lyubov A. Frolova,¹ Azat F. Akbulatov,¹ and Pavel A. Troshin^2,1*
1 Institute for Problems of Chemical Physics of RAS, Semenov ave. 1, Chernogolovka, Moscow region, 142432, Russia.
² Skolkovo Institute of Science and Technology, Skolkovo Innovation Center, Nobel st. 3, Moscow, 143026, Russian Federation
* troshin2003@inbox.ru

Abstract: 
Hybrid lead iodide based perovskites (e.g. CH₃NH₃PbI₃) have recently demonstrated outstanding electronic properties such as low exciton binding energy (~2 meV), high electron-hole diffusion lengths (>150 m) and excellent charge carrier mobility (>100 cm² V^-1 s^-1). Thin-film perovskite solar cells have delivered certified efficiencies >20%, though industrial application of this technology is hindered by stability issues. While much research has been done to prevent moisture-induced decomposition of hybrid perovskites, studies on degradation pathways that influence their intrinsic stability is lacking.
Here we will discuss thermal, photochemical and electrochemical degradation pathways of a series of complex haloplumbates APbX₃ (X=I, Br) with organic (A⁺= CH₃NH₃⁺, [HC(NH₂)₂]⁺) and inorganic (A⁺=Cs⁺) cations in the absence of exposure to oxygen and moisture (glove box environment). We show that the most common hybrid materials (e.g. MAPbI₃) are intrinsically unstable with respect to the heat- and light-induced degradation under inert atmosphere and, therefore, can hardly sustain the realistic solar fluxes and other environmental operational conditions. On the contrary, we demonstrate that cesium-based all inorganic complex lead halides have far superior stability and, therefore, provide an impetus for creation of highly stable perovskite solar cells.
We will also highlight our recent results proving that all inorganic lead halide perovskites can successfully compete in terms of photovoltaic performance with the most widely used hybrid materials such as MAPbI₃. Excellent intrinsic photochemical and thermal stability of inorganic perovskite materials gives a promise to reach decent solar cell operation lifetimes required for industrial-scale application of the perovskite PV technology.

CV2016 in English_short.doc