Next Article in Journal
Quiet Zone Enhancement for a Target Location Using an Improved Virtual Sensing Algorithm
Previous Article in Journal
Microstrip Patch Antenna Assisted Compact Dual Band Planar Crossover
Open AccessFeature PaperArticle

Study of the Contributions of Donor and Acceptor Photoexcitations to Open Circuit Voltage in Bulk Heterojunction Organic Solar Cells

School of Engineering and Information Technology, Charles Darwin University, Darwin, NT 0909, Australia
*
Author to whom correspondence should be addressed.
Electronics 2017, 6(4), 75; https://doi.org/10.3390/electronics6040075
Received: 1 September 2017 / Revised: 28 September 2017 / Accepted: 28 September 2017 / Published: 3 October 2017
One of the key parameters in determining the power conversion efficiency (PCE) of bulk heterojunction (BHJ) organic solar cells (OSCs) is the open circuit voltage . The processes of exciting the donor and acceptor materials individually in a BHJ OSC are investigated and are found to produce two different expressions for . Using the contributions of electron and hole quasi-Fermi levels and charge carrier concentrations, the two different expressions are derived as functions of the energetics of the donor and acceptor materials and the photo-generated charge carrier concentrations, and calculated for a set of donor-acceptor blends. The simultaneous excitation of both the donor and acceptor materials is also considered and the corresponding , which is different from the above two, is derived. The calculated from the photoexcitation of the donor is found to be somewhat comparable with that obtained from the photoexcitation of the acceptor in most combinations of the donor and acceptor materials considered here. It is also found that the calculated from the simultaneous excitations of donor and acceptor in BHJ OSCs is also comparable with the other two . All three thus derived produce similar results and agree reasonably well with the measured values. All three depend linearly on the concentration of the photoexcited charge carriers and hence incident light intensity, which agrees with experimental results. The outcomes of this study are expected to help in finding materials that may produce higher and hence enhanced PCE in BHJ OSCs. View Full-Text
Keywords: open circuit voltage; power conversion efficiency; photoexcitation; donor material; acceptor material; bulk heterojunction organic solar cells open circuit voltage; power conversion efficiency; photoexcitation; donor material; acceptor material; bulk heterojunction organic solar cells
Show Figures

Figure 1

MDPI and ACS Style

Yeboah, D.; Singh, J. Study of the Contributions of Donor and Acceptor Photoexcitations to Open Circuit Voltage in Bulk Heterojunction Organic Solar Cells. Electronics 2017, 6, 75.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop