Abstract
Solution-processed inorganic solar cells are a promising low-cost alternative to first-generation solar cells1,2. Solution processing at low temperatures combined with the use of non-toxic and abundant elements can help minimize fabrication costs and facilitate regulatory acceptance. However, at present, there is no material that exhibits all these features while demonstrating promising efficiencies. Many of the candidates being explored contain toxic elements such as lead or cadmium (perovskites2,3, PbS4, CdTe5,6 and CdS(Se)7,8) or scarce elements such as tellurium or indium (CdTe and CIGS(Se)/CIS9,10). Others require high-temperature processes such as selenization or sintering, or rely on vacuum deposition techniques (Sb2S(Se)311,12,13, SnS14,15 and CZTS(Se)16). Here, we present AgBiS2 nanocrystals as a non-toxic17, earth-abundant18 material for high-performance, solution-processed solar cells fabricated under ambient conditions at low temperatures (≤100 °C). We demonstrate devices with a certified power conversion efficiency of 6.3%, with no hysteresis and a short-circuit current density of ∼22 mA cm−2 for an active layer thickness of only ∼35 nm.
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References
Kramer, I. J. & Sargent, E. H. The architecture of colloidal quantum dot solar cells: materials to devices. Chem. Rev. 114, 863–882 (2014).
Kazim, S., Nazeeruddin, M. K., Grätzel, M. & Ahmad, S. Perovskite as light harvester: a game changer in photovoltaics. Angew. Chem. Int. Ed. 53, 2812–2824 (2014).
Zhou, H. et al. Interface engineering of highly efficient perovskite solar cells. Science 345, 542–546 (2014).
Chuang, C. M., Brown, P. R., Bulović, V. & Bawendi, M. G. Improved performance and stability in quantum dot solar cells through band alignment engineering. Nature Mater. 13, 796–801 (2014).
Major, J. D., Treharne, R. E., Phillips, L. J. & Durose, K. A low-cost non-toxic post-growth activation step for CdTe solar cells. Nature 511, 334–337 (2014).
Panthani, M. G. et al. High efficiency solution processed sintered CdTe nanocrystal solar cells: the role of interfaces. Nano Lett. 14, 670–675 (2014).
Santra, P. K. & Kamat, P. V. Mn-doped quantum dot sensitized solar cells: a strategy to boost efficiency over 5%. J. Am. Chem. Soc. 134, 2508–2511 (2012).
Pan, Z. et al. Near infrared absorption of CdSexTe1–x alloyed quantum dot sensitized solar cells with more than 6% efficiency and high stability. ACS Nano 7, 5215–5222 (2013).
Reinhard, P. et al. Review of progress toward 20% efficiency flexible CIGS solar cells and manufacturing issues of solar modules. IEEE J. Photovolt. 3, 572–580 (2013).
Romanyuk, Y. E. et al. All solution-processed chalcogenide solar cells—from single functional layers towards a 13.8% efficient CIGS device. Adv. Funct. Mater. 25, 12–27 (2015).
Im, S. H. et al. Toward interaction of sensitizer and functional moieties in hole-transporting materials for efficient semiconductor-sensitized solar cells. Nano Lett. 11, 4789–4793 (2011).
Chang, J. A. et al. Panchromatic photon-harvesting by hole-conducting materials in inorganic–organic heterojunction sensitized-solar cell through the formation of nanostructured electron channels. Nano Lett. 12, 1863–1867 (2012).
Zhou, Y. et al. Thin-film Sb2Se3 photovoltaics with oriented one-dimensional ribbons and benign grain boundaries. Nature Photon. 9, 409–415 (2015).
Steinmann, V. et al. 3.88% efficient tin sulfide solar cells using congruent thermal evaporation. Adv. Mater. 26, 7488–7492 (2014).
Sinsermsuksakul, P. et al. Overcoming efficiency limitations of SnS-based solar cells. Adv. Energy Mater. 4, 1400496 (2014).
Kim, J. et al. High efficiency Cu2ZnSn(S,Se)4 solar cells by applying a double In2S3/CdS emitter. Adv. Mater. 26, 7427–7431 (2014).
Mohan, R. Green bismuth. Nature Chem. 2, 336 (2010).
Vesborg, P. C. K. & Jaramillo, T. F. Addressing the terawatt challenge: scalability in the supply of chemical elements for renewable energy. RSC Adv. 2, 7933–7947 (2012).
Liang, N. et al. Homogenously hexagonal prismatic AgBiS2 nanocrystals: controlled synthesis and application in quantum dot-sensitized solar cells. CrystEngComm 17, 1902–1905 (2015).
Huang, P., Yang, W. & Lee, M. AgBiS2 semiconductor-sensitized solar cells. J. Phys. Chem. C 117, 18308–18314 (2013).
Pejova, B., Grozdanov, I., Nesheva, D. & Petrova, A. Size-dependent properties of sonochemically synthesized three-dimensional arrays of close-packed semiconducting AgBiS2 quantum dots. Chem. Mater. 20, 2551–2565 (2008).
Pejova, B., Nesheva, D., Aneva, Z. & Petrova, A. Photoconductivity and relaxation dynamics in sonochemically synthesized assemblies of AgBiS2 quantum dots. J. Phys. Chem. C 115, 37–46 (2011).
Guin, S. N. & Biswas, K. Cation disorder and bond anharmonicity optimize the thermoelectric properties in kinetically stabilized rocksalt AgBiS2 nanocrystals. Chem. Mater. 25, 3225–3231 (2013).
Chen, C., Qiu, X., Ji, S., Jia, C. & Ye, C. The synthesis of monodispersed AgBiS2 quantum dots with a giant dielectric constant. CrystEngComm 15, 7644–7648 (2013).
Qin, W., Nagase, T., Umakoshi, Y. & Szpunar, J. A. Relationship between microstrain and lattice parameter change in nanocrystalline materials. Philos. Mag. Lett. 88, 169–179 (2008).
Malakooti, R. et al. Shape-controlled Bi2S3 nanocrystals and their plasma polymerization into flexible films. Adv. Mater. 18, 2189–2194 (2006).
Krsmanovi, R. et al. Colloids and surfaces B: biointerfaces adsorption of sulfur onto a surface of silver nanoparticles stabilized with sago starch biopolymer. Colloids Surf. B 73, 30–35 (2009).
Dong, T. et al. One-step synthesis of uniform silver nanoparticles capped by saturated decanoate : direct spray printing ink to form metallic silver films. Phys. Chem. Chem. Phys. 11, 6269–6275 (2009).
Bernechea, M., Cao, Y. & Konstantatos, G. Size and bandgap tunability in Bi2S3 colloidal nanocrystals and its effect in solution processed solar cells. J. Mater. Chem. A 3, 20642–20648 (2015).
Boopathi, K. M. et al. Solution-processable bismuth iodide nanosheets as hole transport layers for organic solar cells. Sol. Energy Mater. Sol. Cells 121, 35–41 (2014).
Cowan, S. R., Roy, A. & Heeger, A. J. Recombination in polymer–fullerene bulk heterojunction solar cells. Phys. Rev. B 82, 245207 (2010).
Kirchartz, T., Deledalle, F., Tuladhar, P. S., Durrant, J. R. & Nelson, J. On the differences between dark and light ideality factor in polymer:fullerene solar cells. J. Phys. Chem. Lett. 4, 2371–2376 (2013).
Chuang, C.-H. M. et al. Open-circuit voltage deficit, radiative sub-bandgap states, and prospects in quantum dot solar cells. Nano Lett. 15, 3286–3294 (2015).
Rath, A. K., Bernechea, M., Martinez, L. & Konstantatos, G. Solution-processed heterojunction solar cells based on p-type PbS quantum dots and n-type Bi2S3 nanocrystals. Adv. Mater. 23, 3712–3717 (2011).
Rath, A. K. et al. Solution-processed inorganic bulk nano-heterojunctions and their application to solar cells. Nature Photon. 6, 529–534 (2012).
Cesaria, M., Caricato, A. P. & Martino, M. Realistic absorption coefficient of ultrathin films. J. Opt. 14, 105701 (2012).
Acknowledgements
The authors thank J. Osmond for ellipsometry measurements and H. Maeckel for developing the TMM simulation code and device-characterization set-ups. The research leading to these results has received funding from Fundació Privada Cellex and the European Community's Seventh Framework Programme (FP7-ENERGY.2012.10.2.1) under grant agreement 308997. The authors acknowledge financial support from the Spanish Ministry of Economy and Competitiveness (MINECO) and the ‘Fondo Europeo de Desarrollo Regional’ (FEDER) through grant MAT2014-56210-R. This work was also supported by AGAUR under the SGR grant (2014SGR1548). N.C. acknowledges support from Marie Curie Actions FP7-PEOPLE-2013-IIF (project no. 622358). G.K. acknowledges financial support from the Spanish Ministry of Economy and Competitiveness, through the ‘Severo Ochoa’ Programme for Centres of Excellence in R&D (SEV-2015-0522).
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M.B. conceived, synthesized and characterized the material, designed experiments and co-wrote the manuscript. N.C. fabricated and characterized the devices, ran and analysed TMM simulations, designed experiments and co-wrote the manuscript. G.X. and D.S. fabricated and characterized the devices. A.S. took the FIB-SEM image. G.K. designed experiments, supervised the work, directed the study and co-wrote the manuscript. All authors discussed the results, and have read and agreed to the publication of this manuscript.
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G.K., N.C. and M.B. have filed a provisional patent application with reference number EP15176300 on AgBiS2 nanocrystal-based solar cells.
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Bernechea, M., Cates, N., Xercavins, G. et al. Solution-processed solar cells based on environmentally friendly AgBiS2 nanocrystals. Nature Photon 10, 521–525 (2016). https://doi.org/10.1038/nphoton.2016.108
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DOI: https://doi.org/10.1038/nphoton.2016.108
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