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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: Fundamentals of Perovskite Photovoltaics III (joint session CPP/DS/HL)

CPP 20.4: Vortrag

Dienstag, 21. März 2017, 10:30–10:45, ZEU 222

Revealing the impact of the potential distribution within high performing Lead Methylammonium Tri-Iodide solar cells with organic contact materials — •Christian Müller^1,2,3, Bernd Epding^2,3, Ramos Bwalya^2,3, Michele Sessolo⁴, Lidón Gil-Escrig⁴, Henk Bolink⁴, Robert Lovrincic^1,3, and Wolfgang Kowalsky^1,2,3 — ¹IHF, TU Braunschweig, Germany — ²KIP, Universität Heidelberg, Germany — ³InnovationLab, Heidelberg, Germany — ⁴Instituto de Ciencia Molecular, Universidad de Valencia, Spain

Over the last few years the power conversion efficiency of organometal-halide perovskite (such as CH₃NH₃PbI₃, MAPI) based solar cells has skyrocketed at an unprecedented rate to values around 22%. However, the understanding of the physical process in the solar cells drags behind the progress of efficiency. For example, the influence of the potential distribution in such cells on their performance is so far not sufficiently studied.
We focus in this work on high performing fully vacuum processed MAPI solar cells with organic contact materials [1]. We will present SKPM measurements on p-i-n and n-i-p solar cell cross sections that map the potential distribution within the device with high spatial resolution. Performing measurements under different conditions enables us to determine the influence of potential barriers at the contact interfaces and of a poling on the cell efficiency.
[1] Energy Environ. Sci., 2016, 9, p. 3456-3463, C. Momblona et al.