Journal
ACS APPLIED NANO MATERIALS
Volume 4, Issue 3, Pages 2887-2894Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.1c00048
Keywords
nontoxic; room temperature; semiconductors; nanocrystals; solar cells
Funding
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program [725165]
- Spanish Ministry of Economy and Competitiveness (MINECO)
- Fondo Europeo de Desarrollo Regional (FEDER) [TEC2017-88655-R]
- Fundacio Privada Cellex
- program CERCA
- Spanish Ministry of Economy and Competitiveness
- ICFOstepstone PhD Programme for Early-Stage Researchers in Photonics - Marie Sklodowska-Curie of the European Commission, through the Severo Ochoa Program for Centers of Excellence in RD [GA665884, SEV-2015-0522]
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This study presents a method for synthesizing metal selenide nanocrystals at room temperature under ambient conditions, leading to the first reported colloidal AgBiSe2 nanocrystal solar cell in the literature, which achieved a power conversion efficiency up to 2.6%. This synthesis route is expected to pave the way for low-cost, environmentally friendly, and solution-processed photovoltaics.
Metal selenide nanocrystals have attracted attention as promising materials in photovoltaics and thermoelectrics. However, the expensive and labor-intensive synthesis methods utilized for the production of these nanomaterials have impeded their widespread utilization. The need for an air-free environment and high synthesis temperature for crystal nucleation and growth leads as the major factors contributing to the cost of synthesis. In this work, we present a synthesis method for metal selenide nanocrystals at room temperature under ambient conditions that is enabled by a cost-effective selenium precursor. Thanks to its relative abundance and low toxicity, ternary silver bismuth selenide (AgBiSe2) is used as the prototyping material, as well as silver bismuth sulfide (AgBiS2) and alloyed silver bismuth sulfide-selenide (AgBiSxSey) to show the bandgap tunability of the obtained nanocrystals by utilizing a simple mixed anion precursor approach. A preliminary solar cell made of colloidal AgBiSe2 nanocrystals synthesized via the proposed ambient-condition method yields a power conversion efficiency up to 2.6%, which is the first colloidal AgBiSe2 nanocrystal solar cell reported in the literature to the best of the author's knowledge. This synthesis route is expected to pave the way for low-cost, environmentally friendly, and solution-processed photovoltaics.
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