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High performance photovoltaic applications using solution-processed small molecules.

Yongsheng Chen1, Xiangjian Wan, Guankui Long

  • 1Key Laboratory of Functional Polymer Materials and the Centre of Nanoscale Science and Technology, Institute of Polymer Chemistry, College of Chemistry, Nankai University , Tianjin 300071, China.

Accounts of Chemical Research
|August 2, 2013
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Summary

Small molecule organic photovoltaics (SM-OPVs) offer a promising alternative to silicon solar cells. Solution-processed SM-OPVs, utilizing tailored molecular structures, are emerging as a key technology for sustainable energy generation.

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Organic Electronics

Background:

  • Silicon-based photovoltaics face limitations in cost, flexibility, and environmental impact.
  • Organic photovoltaics (OPVs) present a viable alternative, with polymer-based OPVs (P-OPVs) achieving over 9% power conversion efficiency (PCE).
  • Small molecule OPVs (SM-OPVs) offer advantages over P-OPVs, including structural definition, higher charge mobility, and tunable synthesis.

Purpose of the Study:

  • To explore the potential of solution-processed small molecule organic photovoltaics (SM-OPVs).
  • To synthesize and characterize novel organic molecules for efficient solar energy conversion.
  • To advance the performance of SM-OPVs through molecular design and optimization.

Main Methods:

  • Synthesis of oligothiophene derivatives with acceptor-donor-acceptor (A-D-A) structures.
  • Tuning backbone conjugation length and terminal electron-withdrawing groups to optimize light absorption and energy levels.
  • Fabrication and testing of solution-processed SM-OPV devices.

Main Results:

  • Oligothiophene derivatives with a 7-thiophene-unit backbone and 3-ethylrhodanine terminal units achieved a 6.1% PCE.
  • Replacing the central thiophene unit with benzo[1,2-b:4,5-b']dithiophene (BDT) or dithienosilole (DTS) cores led to devices with 8.12% PCE.
  • External research groups also reported high PCEs (>8%) using DTS-based core units.

Conclusions:

  • Solution-processed SM-OPVs are a significant emerging technology for solar energy.
  • Molecular engineering, including backbone and terminal group modification, is crucial for enhancing SM-OPV performance.
  • SM-OPVs demonstrate performance comparable to P-OPVs and hold great promise for future renewable energy applications.