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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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7.7% Efficient All-Polymer Solar Cells.

Ye-Jin Hwang1, Brett A E Courtright1, Amy S Ferreira2

  • 1Department of Chemical Engineering and Department of Chemistry, University of Washington, Seattle, WA, 98195-1750, USA.

Advanced Materials (Deerfield Beach, Fla.)
|July 3, 2015
PubMed
Summary
This summary is machine-generated.

Controlling self-organization in all-polymer solar cells improved performance. This breakthrough achieved a record 7.7% power conversion efficiency using novel copolymer materials.

Keywords:
all-polymer solar cellsbenzodithiophene-thieno[3,4-b]thiophene copolymerblend self-organizationnaphthalene diimide copolymerspolymer/polymer blends

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • All-polymer solar cells (APSCs) offer potential advantages like mechanical flexibility and low-cost processing.
  • Achieving high power conversion efficiency (PCE) in APSCs remains a challenge due to limitations in charge transport and morphology control.
  • Developing efficient acceptor and donor materials is crucial for advancing APSC technology.

Purpose of the Study:

  • To investigate the effect of polymer/polymer blend self-organization rate on the performance of all-polymer solar cells.
  • To develop high-performance all-polymer solar cells utilizing novel naphthalene diimide-selenophene copolymer acceptors and benzodithiophene-thieno[3,4-b]thiophene copolymer donors.

Main Methods:

  • Fabrication of all-polymer solar cells using a naphthalene diimide-selenophene copolymer as the acceptor and a benzodithiophene-thieno[3,4-b]thiophene copolymer as the donor.
  • Controlled manipulation of the polymer/polymer blend self-organization rate during device fabrication.
  • Characterization of device performance, including power conversion efficiency (PCE) and short-circuit current density (Jsc).

Main Results:

  • Achieved a record power conversion efficiency (PCE) of 7.7% in the all-polymer solar cells.
  • Obtained a record short-circuit current density (Jsc) of 18.8 mA cm(-2).
  • Demonstrated the critical role of controlling the self-organization rate in optimizing blend morphology and device performance.

Conclusions:

  • Controlling the self-organization rate of polymer blends is a key strategy for enhancing the performance of all-polymer solar cells.
  • The developed naphthalene diimide-selenophene copolymer acceptor and benzodithiophene-thieno[3,4-b]thiophene copolymer donor system shows significant promise for high-efficiency organic photovoltaics.
  • This work sets a new benchmark for efficiency in all-polymer solar cells and highlights a viable pathway for future material and device optimization.