Passivation Using Molecular Halides Increases Quantum Dot Solar Cell Performance.

Passivation Using Molecular Halides Increases Quantum Dot Solar Cell Performance.

Advanced materials (Deerfield Beach, Fla.) (2015-11-19)

Xinzheng Lan, Oleksandr Voznyy, Amirreza Kiani, F Pelayo García de Arquer, Abdullah Saud Abbas, Gi-Hwan Kim, Mengxia Liu, Zhenyu Yang, Grant Walters, Jixian Xu, Mingjian Yuan, Zhijun Ning, Fengjia Fan, Pongsakorn Kanjanaboos, Illan Kramer, David Zhitomirsky, Philip Lee, Alexander Perelgut, Sjoerd Hoogland, Edward H Sargent

PMID26576685

ABSTRACT

A solution-based passivation scheme is developed featuring the use of molecular iodine and PbS colloidal quantum dots (CQDs). The improved passivation translates into a longer carrier diffusion length in the solid film. This allows thicker solar-cell devices to be built while preserving efficient charge collection, leading to a certified power conversion efficiency of 9.9%, which is a new record in CQD solar cells.

MATERIALS

Product Number

Brand

Product Description

900733

Sigma-Aldrich

PbS core-type quantum dots, oleic acid coated, fluorescence λ_em 900 nm, 10 mg/mL in toluene

900734

Sigma-Aldrich

PbS core-type quantum dots, fluorescence λ_em 1000 nm, 10 mg/mL in toluene

900738

Sigma-Aldrich

PbS core-type quantum dots, fluorescence λ_em 1400 nm, 10 mg/mL in toluene

900727

Sigma-Aldrich

PbS core-type quantum dots, fluorescence λ_em 1600 nm, 10 mg/mL in toluene

900735

Sigma-Aldrich

PbS core-type quantum dots, oleic acid coated, fluorescence λ_em 1100 nm, 10 mg/mL in toluene