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P-N junction01:11

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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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Solution-processable singlet fission photovoltaic devices.

Le Yang1, Maxim Tabachnyk, Sam L Bayliss

  • 1Cavendish Laboratory , J J Thomson Avenue, Cambridge CB3 0HE, United Kingdom.

Nano Letters
|December 18, 2014
PubMed
Summary
This summary is machine-generated.

This study introduces a novel solution-processable singlet fission material, TIPS-pentacene, for enhanced photovoltaic devices. This material efficiently converts light into electricity, achieving high power conversion efficiencies and external quantum efficiencies.

Keywords:
Singlet fissionTIPS-pentacenecolloidal nanocrystalshybrid photovoltaicsmultiple carrier generationquantum dots

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Area of Science:

  • Materials Science
  • Photovoltaics
  • Organic Electronics

Background:

  • Singlet fission (SF) is an efficient photophysical process for generating multiple excitons from single high-energy photons.
  • Developing solution-processable SF materials is crucial for low-cost, large-area photovoltaic applications.
  • Existing SF materials often require complex processing or lack sufficient efficiency in device architectures.

Purpose of the Study:

  • To demonstrate the integration of a solution-processable singlet fission material, 6,13-bis(triisopropylsilylethynyl)pentacene (TIPS-pentacene), into photovoltaic devices.
  • To investigate the performance of TIPS-pentacene based solar cells, leveraging its exciton multiplication capabilities.
  • To combine TIPS-pentacene with lead chalcogenide nanocrystals for broad spectral absorption in a single device.

Main Methods:

  • Incorporation of TIPS-pentacene as an active layer in photovoltaic devices.
  • Fabrication of hybrid solar cells combining TIPS-pentacene with lead selenide (PbSe) nanocrystals.
  • Characterization of device performance, including power conversion efficiency (PCE) and external quantum efficiency (EQE).

Main Results:

  • Successful fabrication of photovoltaic devices utilizing solution-processable TIPS-pentacene.
  • Achieved maximum power conversion efficiencies exceeding 4.8%.
  • External quantum efficiencies reached up to 60% within the TIPS-pentacene absorption range, with internal quantum efficiencies of 170 ± 30% when paired with suitable PbSe nanocrystals.

Conclusions:

  • This work presents the first efficient, solution-processable singlet fission system for photovoltaic applications.
  • The demonstrated hybrid device architecture offers a promising pathway for enhancing solar energy conversion.
  • The results highlight the potential of singlet fission materials to significantly boost the photocurrent generation in solar cells.