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Area of Science:

  • Materials Science
  • Photovoltaics
  • Organic Electronics

Background:

  • Molecular photon upconversion via triplet-triplet annihilation (TTA-UC) offers a route to enhance solar cell efficiency beyond the Shockley-Quiesser limit.
  • Current solar cell technologies face inherent efficiency limitations that TTA-UC could potentially overcome.

Purpose of the Study:

  • To explore the integration of TTA-UC using metal ion-linked multilayers within organic-inorganic hybrid solar cells.
  • To achieve efficient photocurrent generation from upconverted photons.

Main Methods:

  • Fabrication of self-assembled multilayers of acceptor and sensitizer molecules linked by metal ions.
  • Incorporation of these multilayers into an organic-inorganic hybrid solar cell architecture.
  • Characterization of upconverted emission and photocurrent generation under solar flux.

Main Results:

  • Demonstrated successful integration of TTA-UC multilayers into hybrid solar cells.
  • Achieved a record photocurrent contribution of 0.158 mA cm-2 from the upconverted state under 1 sun solar flux.
  • Gained mechanistic insights into rate- and efficiency-limiting processes.

Conclusions:

  • The developed TTA-UC strategy shows significant potential for boosting solar cell performance.
  • Further optimization is required to overcome limiting factors and enable TTA-UC solar cells to surpass the SQ limit.
  • Efficient TTA-UC could have a substantial impact on existing high-performance solar cell technologies.