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Understanding charge carrier dynamics in a P3HT:FLR blend
Jessica Patel1, Abhishek Sharma, Mihirsinh Chauhan
1Department of Science, School of Technology, Pandit Deendayal Petroleum University, Gandhinagar 382007, India. manoj.pandey@sot.pdpu.ac.in.
Physical Chemistry Chemical Physics : PCCP
|January 23, 2019
Summary
This study investigates charge generation in organic solar cells using P3HT:FLR blends. Non-halogenated solvents enhance charge generation by influencing aggregation and exciton bandwidth, crucial for efficient optoelectronic devices.
Area of Science:
- Materials Science
- Organic Electronics
- Photophysics
Background:
- Optical absorption in organic semiconductors is key for optoelectronic device performance, generating excitons that become charge carriers.
- Understanding charge generation mechanisms in non-fullerene organic solar cells is crucial for performance optimization.
- The blend of poly(3-hexylthiophene) (P3HT) as an electron donor and 1,6,7,10-tetramethylfluoranthene (FLR) as a non-fullerene acceptor is used.
Purpose of the Study:
- To investigate the charge generation mechanism in P3HT:FLR blends using various solvents.
- To elucidate the influence of solvent polarity on aggregation behavior, exciton bandwidth, and charge transport.
- To analyze ultrafast charge generation and separation dynamics using transient absorption spectroscopy.
Main Methods:
- Steady-state UV-visible and photoluminescence spectroscopy.
- Ultrafast visible-near-infrared (vis-NIR) transient absorption spectroscopy (450–1600 nm).
- Systematic variation of solvent polarity and analysis of lifetime kinetics.
Main Results:
- Solvent choice significantly impacts aggregation behavior and exciton bandwidth, influencing charge transport.
- Charge generation in P3HT:FLR blends occurs on a picosecond (ps) timescale (∼1–5 ps and ∼500 ps decay terms).
- Non-halogenated solvents promote aggregation and photoluminescence quenching, leading to higher charge generation.
Conclusions:
- The P3HT:FLR blend exhibits efficient charge generation on a ps timescale, indicating good component intermixing.
- Non-halogenated solvents and optimized solvent-material combinations are essential for enhancing charge generation in organic solar cells.
- FLR is a promising non-fullerene acceptor for improving organic optoelectronic device performance.
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