Quantifying the Nongeminate Recombination Dynamics in Nonfullerene Bulk Heterojunction Organic Solar Cells

In this study, a comprehensive analytical model to quantify the total nongeminate recombination losses, originating from bimolecular as well as bulk and surface trap‐assisted recombination mechanisms in nonfullerene‐based bulk heterojunction organic solar cells is developed. This proposed model is s...

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Bibliographic Details
Published in:Advanced energy materials 2019-08, Vol.9 (32), p.n/a
Main Authors: Vollbrecht, Joachim, Brus, Viktor V., Ko, Seo‐Jin, Lee, Jaewon, Karki, Akchheta, Cao, David Xi, Cho, Kilwon, Bazan, Guillermo C., Nguyen, Thuc‐Quyen
Format: Article
Language:English
Subjects:
Circuits
Dependence
Electric potential
Heterojunctions
impedance spectroscopy
Light
Luminous intensity
Mathematical models
nonfullerene acceptors
nongeminate recombination
Optoelectronics
organic bulk heterojunction solar cells
Organic chemistry
Photovoltaic cells
Solar cells
Voltage
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Summary:In this study, a comprehensive analytical model to quantify the total nongeminate recombination losses, originating from bimolecular as well as bulk and surface trap‐assisted recombination mechanisms in nonfullerene‐based bulk heterojunction organic solar cells is developed. This proposed model is successfully employed to obtain the different contributions to the recombination current of the investigated solar cells under different illumination intensities. Additionally, the model quantitatively describes the experimentally measured open‐circuit voltage versus light intensity dependence. Most importantly, it is possible to calculate the experimental results with the same fitting parameter values from the presented model. The validity of this model is also proven by a combination of other independent, steady‐state, and transient experimental techniques. This new powerful analytical tool will enable researchers in the photovoltaic community to take into account the synergetic contribution from all relevant types of nongeminate recombination losses in different optoelectronic systems and target their analysis of recombination dynamics at any operating voltage. A comprehensive analytical model capable of quantifying bimolecular, bulk and surface trap‐assisted contributions to the overall nongeminate recombination losses in organic solar cells is reported. Common techniques such as light intensity‐dependent current density–voltage characteristics, capacitance spectroscopy, and open‐circuit voltage decay yield the necessary experimental data to successfully apply this analytical model.
ISSN:1614-6832
1614-6840
DOI:10.1002/aenm.201901438