Quantifying Charge Extraction and Recombination Using the Rise and Decay of the Transient Photovoltage of Perovskite Solar Cells

Author:

Krückemeier Lisa12,Liu Zhifa1,Kirchartz Thomas13ORCID,Rau Uwe12

Affiliation:

1. IEK5‐Photovoltaik Forschungszentrum Jülich 52425 Jülich Germany

2. Jülich Aachen Research Alliance JARA‐Energy and Faculty of Electrical Engineering and Information Technology RWTH Aachen University Schinkelstr. 2 52062 Aachen Germany

3. Faculty of Engineering and CENIDE University of Duisburg‐Essen Carl‐Benz‐Str. 199 47057 Duisburg Germany

Abstract

AbstractThe extraction of photogenerated charge carriers and the generation of a photovoltage belong to the fundamental functionalities of any solar cell. These processes happen not instantaneously but rather come with finite time constants, e.g., a time constant related to the rise of the externally measured open circuit voltage following a short light pulse. Herein, a new method to analyze transient photovoltage measurements at different bias light intensities combining rise and decay times of the photovoltage. The approach uses a linearized version of a system of two coupled differential equations that are solved analytically by determining the eigenvalues of a 2 × 2 matrix. By comparison between the eigenvalues and the measured rise and decay times during a transient photovoltage measurement, the rates of carrier recombination and extraction as a function of bias voltage are determined, and establish a simple link between their ratio and the efficiency losses in the perovskite solar cell.

Funder

Helmholtz-Gemeinschaft

Deutsche Forschungsgemeinschaft

Publisher

Wiley

Subject

Mechanical Engineering,Mechanics of Materials,General Materials Science

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