Quantifying the Nongeminate Recombination Dynamics in Nonfullerene Bulk Heterojunction Organic Solar Cells
Abstract
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 15, 2019
- Source ID
- 10.1002/aenm.201901438
Entities
People
- Akchheta Karki
- David Xi Cao
- Guillermo C. Bazan
- Jaewon Lee
- Joachim Vollbrecht
- Kilwon Cho
- Seo‐Jin Ko
- Thuc‐quyen Nguyen
- Viktor V. Brus
Organizations
- Alexander von Humboldt Foundation
- Korea Research Institute of Chemical Technology
- Office of Naval Research
- Pohang University of Science and Technology
- University of California, Santa Barbara