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Solution-Processed, Inverted AgBiS2 Nanocrystal Solar Cells.

Dezhang Chen1, Sunil B Shivarudraiah1, Pai Geng1,2

  • 1Department of Chemistry, The Hong Kong University of Science and Technology, Kowloon 999077, Hong Kong SAR.

ACS Applied Materials & Interfaces
|December 27, 2021
PubMed
Summary
This summary is machine-generated.

Silver bismuth sulfide (AgBiS2) nanocrystal solar cells offer a nontoxic alternative for photovoltaics. The first inverted (p-i-n) AgBiS2 solar cells achieved 4.3% power conversion efficiency, demonstrating improved charge collection.

Keywords:
AgBiS2NiO nanoparticlesinorganic hole-transporting layerslead-freep−i−n inverted solar cell

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Renewable Energy

Background:

  • Lead sulfide (PbS), cesium lead iodide (CsPbI3), and cadmium sulfide (CdS) quantum dots are widely used in nanocrystal photovoltaics but raise toxicity concerns.
  • AgBiS2 nanocrystals present a promising, nontoxic alternative for solution-processed solar cells.

Purpose of the Study:

  • To fabricate and characterize the first inverted (p-i-n) AgBiS2 nanocrystal solar cells.
  • To investigate the charge carrier collection dynamics at metal oxide/AgBiS2 interfaces.
  • To compare the performance of inverted (p-i-n) and conventional (n-i-p) AgBiS2 solar cells.

Main Methods:

  • Fabrication of inverted (p-i-n) AgBiS2 solar cells using spray-coated NiO as the hole-transporting layer and PCBM/BCP as the electron-transporting layer.
  • Utilized transient photocurrent and photovoltage measurements.
  • Employed femtosecond transient absorption spectroscopy to study charge collection processes.

Main Results:

  • The NiO/AgBiS2 nanocrystal junction in the p-i-n configuration demonstrated more efficient charge carrier collection compared to n-i-p devices.
  • The fabricated p-i-n AgBiS2 solar cells achieved a power conversion efficiency (PCE) of 4.3%.
  • Inverted devices exhibited a high short-circuit current (JSC) exceeding 20.7 mA cm-2 and an open-circuit voltage (VOC) of 0.38 V.

Conclusions:

  • Inverted (p-i-n) AgBiS2 nanocrystal solar cells are a viable and efficient alternative to traditional n-i-p configurations.
  • The improved charge collection at the NiO/AgBiS2 interface in the inverted structure suggests potential for higher efficiencies.
  • These findings highlight the promise of AgBiS2 nanocrystals for scalable and efficient solar energy applications.