Energy transfer in ternary blend organic solar cells: recent insights and future directions

Resonance energy transfer (RET) can potentially improve the device efficiencies of ternary blend organic solar cells (TBSCs). However, several parameters, such as domain morphology, exciton lifetime, energy and charge transfer, influence the resulting photophysics. Owing to this, spectroscopic studi...

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Published inEnergy & environmental science Vol. 14; no. 1; pp. 32 - 319
Main Authors Mohapatra, Aiswarya Abhisek, Tiwari, Vivek, Patil, Satish
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 01.01.2021
Subjects
Charge transfer
Cytology
Energy charge
Energy transfer
Excitons
Morphology
Photoelectric effect
Photoelectric emission
Photosynthesis
Photovoltaic cells
Solar cells
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Summary:Resonance energy transfer (RET) can potentially improve the device efficiencies of ternary blend organic solar cells (TBSCs). However, several parameters, such as domain morphology, exciton lifetime, energy and charge transfer, influence the resulting photophysics. Owing to this, spectroscopic studies on TBSCs have not unambiguously deconvolved the role of RET in the observed enhancement of photocurrent densities, often downplaying the mechanistic aspects of the RET associated enhancement. In this perspective, we discuss and analyse the role of RET in enhancing the device efficiency by taking a few recent examples of TBSCs. Taking analogy from natural photosynthetic systems, we argue that deviations in the observed RET rates from a Förster type mechanism may be at play. We suggest new strategies to systematically correlate the Förster critical distance ( R 0 ) with increments in current density (Δ J SC ) in order to gain mechanistic insights to optimize RET enhanced photocurrent for high efficiency organic solar cells. Resonance energy transfer in ternary blend organic solar cells is discussed by drawing parallels from natural photosynthetic proteins.
Bibliography:Aiswarya Abhisek Mohapatra is a Postdoctoral researcher in the group of Prof. Satish Patil at Indian Institute of Science, Bangalore, India. He received his PhD degree from the same group after finishing his Masters in Chemistry Honours from University of Hyderabad, India. His doctoral thesis work was focused on role of energy transfer in the enhancement of power conversion efficiency of organic solar cells. Abhisek is interested in the fundamental properties of organic semiconductors and the physics of organic solar cells.
Vivek Tiwari is an Assistant Professor at Indian Institute of Science, Bangalore. He did his PhD in Chemical Physics at the University of Colorado Boulder under the supervision of Prof. David Jonas. He conducted his postdoctoral work in the group of Prof. Jennifer Ogilvie at the University of Michigan. His group is interested in understanding the interplay of vibrational and electronic motions which drive ultrafast energy and charge delocalization. To this end, his group develops spectro-imaging techniques and theoretical models to address the above physics in natural and artificial photosynthetic systems.
Satish Patil is a Professor at Indian Institute of Science, Bangalore. He did his PhD in polymer chemistry with Prof. Ullrich Scherf at Bergische Universität Wuppertal. He did his postdoctoral work with Prof. Fred Wudl at the University of California, Los Angeles. His research group at Indian Institute of Science, Bangalore is engaged in developing π-conjugated polymers and oligomers for molecular electronics.
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ISSN:1754-5692
1754-5706
DOI:10.1039/d0ee03170d