Interfacial Recombination Kinetics in Aged Perovskite Solar Cells Measured Using Transient Photovoltage Techniques
Jesus Jimenez Lopez a b, Emilio Palomares a c
a Institute of Chemical Research of Catalonia (ICIQ), Barcelona Institute of Science and Technology (BIST), Avinguda dels Països Catalans, 16, Tarragona, Spain
b Departament d’Enginyeria Electrònica, Elèctrica i Automàtica, Universitat Rovira i Virgili, Avinguda dels Països Catalans, 26, Tarragona, Spain
c Institució Catalana de Recerca i Estudis Avançats (ICREA), Spain, Passeig Lluis Companys 23, Barcelona, Spain
nanoGe Fall Meeting
Proceedings of nanoGe Fall Meeting19 (NGFM19)
#PERInt19. Interplay of composition, structure and electronic properties in halide-perovskites
Berlin, Germany, 2019 November 3rd - 8th
Organizer: Pablo P. Boix
Poster, Jesus Jimenez Lopez, 416
Publication date: 18th July 2019

Understanding the origin of major carrier losses in perovskite solar cells is key to increase the final device photovoltaic efficiency. In this regard, the reduction of interfacial charge carrier recombination, which supposes one of the major carrier losses, has been identified as a good strategy to get higher efficiencies. Several techniques have been used to study charge carrier recombination. Among them, transient photovoltage (TPV) has been widely used, as it allows studying charge carrier recombination under operando conditions. Interestingly, it has been described recently a novel negative transient deflection in perovskite solar cells when measuring TPV transients at the early stages of illumination. This negative deflection is correlated with the ionic accumulation at the perovskite interfaces, which is a process that requires great attention to fully understand how perovskite solar cells work. In this work, we have monitored the evolution of this negative trace with the aging of the perovskite solar cells. We correlate the disappearance of the negative signal with the enhancement of the device open-circuit voltage and fill factor, therefore, the device efficiency. We hypothesize that the increase in device efficiency is because of a better/faster ion redistribution within the perovskite material after the aging of the solar cells, which reduces charge carrier recombination at the interfaces.

© Fundació Scito
We use our own and third party cookies for analysing and measuring usage of our website to improve our services. If you continue browsing, we consider accepting its use. You can check our Cookies Policy in which you will also find how to configure your web browser for the use of cookies. More info