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Direct Synthesis of Semiconductive AgBiS NC Inks toward High-Efficiency, Low-Cost and Environmental-Friendly Solar Cells.

Angew Chem Int Ed Engl

December 2024

Institute of Functional Nano & Soft Materials (FUNSOM), Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, 215123, Jiangsu, PR China.

Silver bismuth sulfide nanocrystals (AgBiS NCs) embody a pioneering heavy-metal-free photovoltaic material renowned for its ultrahigh absorption coefficient, offering promising opportunities for advancing the field of ultra-thin and biocompatible solar cells. Currently, the fabrication of AgBiS NC photovoltaic devices relies on hot-injection synthesis and subsequent tedious ligand exchange, leading to high production cost, complex processes and environmental pollution. Here, we developed a direct-synthesis (DS) method without ligand-exchange for AgBiS NC semiconductive inks, significantly simplifying the material preparation and device fabrication processes.

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Article Synopsis
  • - Silver bismuth disulfide (AgBiS) colloidal nanocrystals (CNCs) are eco-friendly materials with great photoconductivity, and when used in solar cells, they meet RoHS guidelines for hazardous substances.
  • - To enhance their performance, a new diketopyrrolopyrrole (DPP)-based polymer called BD2FCT is introduced as a hole transport layer, optimizing charge transfer and reducing recombination at the interfaces of the CNCs.
  • - The collaboration of BD2FCT with a low-bandgap acceptor, IEICO-4F, leads to more efficient hole transfer and improved overall solar cell performance, achieving a 10.1% power conversion efficiency.
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AgBiS quantum dots (ABS QDs) have emerged as highly promising candidates for photovoltaic applications due to their strong sunlight absorption, nontoxicity, and elemental availability. Nevertheless, the efficiencies of ABS solar cells currently fall far short of their thermodynamic limits due in large part to sluggish charge transport characteristics in nanocrystal-derived films. In this study, we overcome this limitation by tuning the surfaces of ABS semiconductor QDs via a solvent-induced ligand exchange (SILE) strategy and provide key insights into the role of surface composition on both - and -type charge transfer doping, as well as long-range charge transport.

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Article Synopsis
  • - Chiral semiconducting nanomaterials, like AgBiS nanocrystals (NCs), have great potential in various fields, but achieving a strong circular dichroism (CD) signal has been challenging due to complex surface engineering and unclear mechanisms.
  • - A new strategy involving chiral ligand exchange with cysteine was developed, leading to significant enhancements in the CD signal in the near-UV region, with peaks at 260 and 320 nm, which help explain the ligand binding effects on the signal.
  • - The research utilized density-functional theory to show how ligand interactions cause crystal distortion and efficient electron transfer, resulting in an impressive CD signal, which was further validated by creating a spin-filter device with over 86
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Dual-mode biosensor using Tb-Cu MOF@Au nanoenzyme to effectively quench the photocurrent of BiO/BiS/AgBiS heterojunction and emit fluorescence for neuron-specific enolases detection.

Talanta

September 2024

Collaborative Innovation Center for Green Chemical Manufacturing and Accurate Detection, Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan, 250022, PR China; Department of Chemistry, Sungkyunkwan University, Suwon, 16419, Republic of Korea. Electronic address:

Article Synopsis
  • A novel dual-mode biosensor was developed for the ultrasensitive detection of neuron-specific enolase (NSE) using a combination of Tb-Cu MOF@Au nanozyme and BiO/BiS/AgBiS composites to enhance signal detection.
  • This biosensor features two detection methods: photoelectrochemical (PEC) with a detection range of 0.00005 to 200 ng/mL and a low limit of 20 fg/mL, and fluorescent (FL) with a range of 0.001 to 200 ng/mL and a limit of 0.65 pg/mL.
  • The research indicates that this dual-mode biosensor shows great promise for accurately detecting disease markers, potentially aiding in medical
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