TY - JOUR
T1 - Quantifying the Nongeminate Recombination Dynamics in Nonfullerene Bulk Heterojunction Organic Solar Cells
AU - Vollbrecht, Joachim
AU - Brus, Viktor V.
AU - Ko, Seo Jin
AU - Lee, Jaewon
AU - Karki, Akchheta
AU - Cao, David Xi
AU - Cho, Kilwon
AU - Bazan, Guillermo C.
AU - Nguyen, Thuc Quyen
N1 - Funding Information:
J.V. and V.V.B. contributed equally to this work. J.V. acknowledges primary funding by the Alexander-von-Humboldt Stiftung. J.V., V.V.B., S.-J.K., and T.-Q.N. acknowledge funding by the Office of Naval Research (ONR) grant #N000141410076. J.L. acknowledges funding by the Center for Advanced Soft Electronics under the Global Frontier Research Program (code no. 2011-0031628) of the Ministry of Science and ICT, Korea. The authors thank Dr. Alexander Mikhailovsky and Ben R. Luginbuhl for assistance with building the VOC-decay measurement setup as well as Jianfei Huang, Alexander Lill, Nora Schopp, Brett Yurash, Zhifang Du, and Simon Biberger for fruitful discussions.
PY - 2019
Y1 - 2019
N2 - 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.
AB - 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.
KW - impedance spectroscopy
KW - nonfullerene acceptors
KW - nongeminate recombination
KW - organic bulk heterojunction solar cells
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U2 - 10.1002/aenm.201901438
DO - 10.1002/aenm.201901438
M3 - Article
AN - SCOPUS:85069739864
VL - 9
JO - Advanced Energy Materials
JF - Advanced Energy Materials
SN - 1614-6832
IS - 32
M1 - 1901438
ER -