Improving Stability of Perovskite Solar Cells Using Conjugated Polymer-fullerene Derivative Composite as Electron Transport Layer
Alexandra Gordeeva a b, Mohamed Elnaggar a b, Alexander Akkuratov b, Pavel Troshin a b
a Skoltech - Skolkovo Institute of Science and Technology, Moscow, Bolshoy Boulevard 30, Moskva, Russian Federation
b The Institute for Problems of Chemical Physics of the Russian Academy of Sciences RAS, Russia, Semenov Prospect 1, Russian Federation
Proceedings of Online School on Hybrid, Organic and Perovskite Photovoltaics (HOPE-PV)
Online, Spain, 2020 November 3rd - 13th
Organizers: Sergey M. Aldoshin, Jovana Milic, Keith Stevenson and Pavel Troshin
Poster, Alexandra Gordeeva, 049
Publication date: 23rd October 2020
ePoster: 

Perovskite solar cells (PSCs) have attracted a significant attention as a rapidly developing 3rd generation photovoltaic technology with a record efficiency of 25.2%.  However, the commercialization of PSCs is strongly impeded by their low operational stability under realistic conditions [1], [2]. One of the mechanisms of PSCs degradation is based on the interaction of perovskite decomposition products with charge transport interlayers and electrodes [3]. We showed previously that chemical reaction at the interface between the perovskite absorber and [60]PCBM (phenyl C61 butyric acid methyl ester) used as electron transport layer (ETL) is largely responsible for the degradation of p-i-n perovskite solar cells [4]. Therefore, improving operational stability of p-i-n PSCs requires replacing fullerene-based ETLs with some alternative materials that must be chemically inert with respect to complex lead halides.

In this work, a novel n-type polymer with pyrrolo[3,4-c]pyrrole-1,4-dione building blocks was designed and investigated as electron transport material (ETL) for perovskite solar cells. Using the optimized blend of the synthesized polymer with the fullerene derivative [60]PCBM as ETL provided >16% device efficiency and good operational stability within 1200 hours under continuous light exposure.

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