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Tetrathienoanthracene-based copolymers for efficient solar cells.

Feng He¹, Wei Wang, Wei Chen

¹Department of Chemistry and The James Franck Institute, The University of Chicago, 929 E 57th Street, Chicago, Illinois 60637, United States.

Journal of the American Chemical Society

|February 22, 2011

Summary

New semiconducting copolymers with extended π-conjugated tetrathienoanthracene units improve π-π stacking and charge transport. Optimized polymers achieved a 5.6% power conversion efficiency (PCE) in solar cells.

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Area of Science:

Materials Science
Organic Electronics
Polymer Chemistry

Background:

Semiconducting copolymers are crucial for organic electronic devices.
Extended π-conjugation is key to enhancing charge transport properties.
Tetrathienoanthracene units offer a promising building block for novel polymers.

Purpose of the Study:

To synthesize novel semiconducting copolymers (PTAT-x) incorporating extended π-conjugated tetrathienoanthracene units.
To investigate the effect of extended conjugation on π-π stacking and charge transport.
To optimize polymer structure for improved performance in organic solar cells.

Main Methods:

Synthesis of a series of PTAT-x semiconducting copolymers.
Fabrication and characterization of polymer/PC(61)BM blend films.
Performance evaluation of heterojunction solar cell devices.

Main Results:

The synthesized PTAT-x copolymers feature extended π-conjugated tetrathienoanthracene units.
Enhanced π-π stacking and facilitated charge transport were observed due to the extended conjugation.
The PTAT-3 copolymer, with 2-butyloctyl side chains, achieved a power conversion efficiency (PCE) of 5.6% when blended with PC(61)BM.

Conclusions:

Extended π-conjugation in tetrathienoanthracene-based copolymers effectively enhances π-π stacking and charge transport.
Structural modification, specifically the incorporation of bulky side chains, is critical for optimizing polymer performance.
These findings highlight the potential of PTAT-x copolymers for efficient organic solar cell applications.