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Related Concept Videos

P-N junction01:11

P-N junction

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-processed DPP-based small molecule that gives high photovoltaic efficiency with judicious device

Jianhua Huang1, Chuanlang Zhan, Xin Zhang

  • 1Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China.

ACS Applied Materials & Interfaces
|February 23, 2013
PubMed
Summary

We synthesized a novel diketopyrrolopyrrole (DPP)-based small molecule for efficient organic solar cells. Optimizing solvent and additive use significantly improved device performance, achieving a record power conversion efficiency (PCE).

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Area of Science:

  • Organic electronics
  • Materials science
  • Photovoltaics

Background:

  • Solution-processed small molecules offer a cost-effective alternative for organic solar cell fabrication.
  • Diketopyrrolopyrrole (DPP)-based materials are promising donor components due to their tunable electronic properties and broad absorption spectra.

Purpose of the Study:

  • To synthesize and characterize a novel DPP-based small molecule, BDT-DPP, for use in organic photovoltaic devices.
  • To investigate the effect of different solvents and additives on the morphology and performance of BDT-DPP:PC71BM based solar cells.

Main Methods:

  • Synthesis of BDT-DPP small molecule.
  • Fabrication of organic photovoltaic devices using spin-coating with chloroform (CF) and o-dichlorobenzene (o-DCB) as solvents.
  • Optimization of active layer morphology using 1,8-diiodooctane (DIO) as an additive.

Main Results:

  • Devices fabricated from CF showed poor performance (PCE=2.4%) due to rapid solvent evaporation and unfavorable morphology.
  • Addition of 0.3% DIO to CF improved fill factor (FF) and short-circuit current density (Jsc).
  • Using o-DCB as the solvent, especially with 0.7% DIO, resulted in optimized morphology and a record PCE of 5.29% with a Jsc of 11.86 mA/cm(2), open-circuit voltage (Voc) of 0.72 V, and FF of 62%.

Conclusions:

  • Solvent selection and additive incorporation are critical for controlling active layer morphology in solution-processed organic solar cells.
  • The optimized BDT-DPP:PC71BM devices demonstrate the potential of DPP-based small molecules for high-efficiency organic photovoltaics.
  • This work sets a new benchmark for PCE in solution-processed DPP-based small molecule organic solar cells.