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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 49: Poster Session II

CPP 49.47: Poster

Dienstag, 17. März 2020, 14:00–16:00, P1A

Direct measurement of charge recombinationlosses in organic solar cells by transientspectroscopy — •Florian Günther, Daniel R. B. Amorim, Roberto M. Faria, and Paulo B. Miranda — Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, Brazil

Research on organic solar cells has increased significantly in the past decade, covering both applied and basic aspects. Improvements in their performances depend on a deep knowledge about the photophysical and electronic processes that occur in the materials. The dynamics of charge recombination within operating devices is one important issue being relevant for determining the charge recombination losses and the overall device efficiency. Inour work, we directly probe the dynamics of charge recombination and extraction in organic solar cells by combining transient photoinduced absorption spectroscopy (TAS) with transient photocurrent (TPC) measurements in the ns to ms time range after excitation of the device by a short laser pulse. TAS probes the dynamics of the charge density inside the organic active layer of the solar cell, while TPC measures the rate of charge extraction from the device. Comparing both measurements it is possible to determine how much photogenerated charge is lostwithin the active layer due to charge recombination, a major loss mechanism that limits the overall device efficiency. Using this technique,we have probed high-quality solar cells based on porphyrinderivatives and also traditional polymer-based (P3HT:PCBM) solar cells.