Single-step colloidal quantum dot films for infrared solar harvesting
Sutherland, Brandon R.
Dinh, Cao Thang
Labelle, Andre J.
Ip, Alexander H.
Proppe, Andrew H.
Ahmed, Ghada H.
Mohammed, Omar F.
Sargent, Edward H.
KAUST DepartmentChemical Science Program
KAUST Solar Center (KSC)
Physical Science and Engineering (PSE) Division
Ultrafast Laser Spectroscopy and Four-dimensional Electron Imaging Research Group
Online Publication Date2016-11-01
Print Publication Date2016-10-31
Permanent link to this recordhttp://hdl.handle.net/10754/621843
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AbstractSemiconductors with bandgaps in the near- to mid-infrared can harvest solar light that is otherwise wasted by conventional single-junction solar cell architectures. In particular, colloidal quantum dots (CQDs) are promising materials since they are cost-effective, processed from solution, and have a bandgap that can be tuned into the infrared (IR) via the quantum size effect. These characteristics enable them to harvest the infrared portion of the solar spectrum to which silicon is transparent. To date, IR CQD solar cells have been made using a wasteful and complex sequential layer-by-layer process. Here, we demonstrate ∼1 eV bandgap solar-harvesting CQD films deposited in a single step. By engineering a fast-drying solvent mixture for metal iodide-capped CQDs, we deposited active layers greater than 200 nm in thickness having a mean roughness less than 1 nm. We integrated these films into infrared solar cells that are stable in air and exhibit power conversion efficiencies of 3.5% under illumination by the full solar spectrum, and 0.4% through a simulated silicon solar cell filter.
CitationKiani A, Sutherland BR, Kim Y, Ouellette O, Levina L, et al. (2016) Single-step colloidal quantum dot films for infrared solar harvesting. Applied Physics Letters 109: 183105. Available: http://dx.doi.org/10.1063/1.4966217.
SponsorsThis publication is based in part on the work supported by the Ontario Research Fund-Research Excellence Program, ORF #07-042.
JournalApplied Physics Letters