Journal
OPTICAL MATERIALS
Volume 132, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2022.112852
Keywords
Boron compounds; Numerical simulations; Ternary organic solar cells; Density of trap states; Optimized thickness; Energy band diagrams
Categories
Funding
- CONACYT Mexico [CF19-263955]
- CONACYT
- GDAPA UNAM PAPIIT [TA101221]
- Mexican Network on Sustain- able Technologies for Environmental Applications
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In this study, a new hybrid organic-inorganic ternary solar cell structure using a novel boron compound is proposed. The performance of the device is investigated with different combinations of donor polymers and boron compounds. The highest efficiency of 11.7% is achieved with a ternary solar cell consisting of PTB7 and a borinate with a bandgap of 1.66 eV and a medium trap energy depth of 0.95 eV above the HOMO level.
Ternary solar cells have proven to be a solution to absorb more photons at different wavelengths and reduce the recombination of charge carriers. Here, we propose a new hybrid organic-inorganic ternary planar solar-cell structure using a novel boron compound. The role of this material on the performance of the device with a polymer/borinate/ZnO configuration is studied. As the donor polymer, we evaluate P3HT, PTB7, and PCPDTBT; and three boron compounds with different properties, especially concerning the bandgap and trap energy depth. To validate the experimental electrical characteristics of the borinates, first, we simulate a bilayer structure with C60, subsequently, we simulate and analyze the whole device architecture. The ternary solar cell with PTB7 and a borinate with a bandgap of 1.66 eV and a medium trap energy depth of 0.95 eV above the HOMO level exhibit the highest efficiency, i. e. 11.7%. Furthermore, we present a layer thickness optimization of the materials to reach even higher efficiencies, up to 15.15%. Finally, the effect of the magnitude of the density of trap states in the borinate on the device performance is analyzed.
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