Diffusion-controlled synthesis of PbS and PbSe quantum dots with in situ halide passivation for quantum dot solar cells

ACS Nano
Jianbing ZhangMatthew C Beard

Abstract

We developed a simple non-hot-injection synthetic route that achieves in situ halide-passivated PbS and PbSe quantum dots (QDs) and simplifies the fabrication of Pb-chalcogenide QD solar cells. The synthesis mechanism follows a temperature-dependent diffusion growth model leading to strategies that can achieve narrow size distributions for a range of sizes. We show that PbS QDs can be produced with a diameter as small as 2.2 nm, corresponding to a 1.7 eV band gap, while the resulting size distribution (6-7%) is comparable to that of hot-injection syntheses. The in situ chloride surface passivation is demonstrated by X-ray photoelectron spectroscopy and an improved photostability of both PbS and PbSe QDs when stored under air. Additionally, the photoluminescence quantum yield of the PbS QDs is ∼30% higher compared to the traditional synthesis. We show that PbS QD solar cells with 6.5% power conversion efficiency (PCE) can be constructed. Finally, we fabricated PbSe QD solar cells in air (rather than in inert atmosphere), achieving a PCE of 2.65% using relatively large QDs with a corresponding band gap of 0.89 eV.

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Citations

Dec 30, 2015·Journal of the American Chemical Society·Ju Young WooSohee Jeong
Nov 26, 2015·Journal of the American Chemical Society·Curtis B WilliamsonRichard D Robinson
Oct 30, 2015·ACS Nano·Daniel M BalazsMaria Antonietta Loi
Aug 12, 2015·The Journal of Physical Chemistry Letters·Jianbing ZhangJoseph M Luther
Jul 24, 2015·ACS Nano·Sandeep GhoshRosaria Brescia
May 8, 2015·ACS Nano·Jonathan E HalpertNeil C Greenham
Aug 13, 2015·The Journal of Physical Chemistry Letters·Ashley R MarshallJoseph M Luther
Jun 14, 2016·Nature Materials·Federica BertolottiNorberto Masciocchi
Jul 23, 2016·Journal of the American Chemical Society·Biswajit Bhattacharyya, Anshu Pandey
Jun 12, 2014·Journal of the American Chemical Society·Ju Young WooSohee Jeong
Aug 16, 2015·The Journal of Physical Chemistry Letters·Sungwoo KimSohee Jeong
Dec 21, 2016·Chemical Communications : Chem Comm·Youngjin JangEfrat Lifshitz
Jan 20, 2017·Journal of the American Chemical Society·Michael P CamposJonathan S Owen
Jan 20, 2017·Nano Letters·Rachel H GilmoreWilliam A Tisdale
Apr 22, 2017·Journal of the American Chemical Society·Qianglu LinJeffrey M Pietryga
Dec 4, 2014·Nature Nanotechnology·Matthew C BeardArthur J Nozik
Mar 25, 2018·Advanced Materials·Hyek Jin KwonTaeghwan Hyeon
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Jun 22, 2019·Advanced Materials·Waqar AhmadChao Chen
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Jan 9, 2018·Journal of Materials Chemistry. A, Materials for Energy and Sustainability·John HongJong Min Kim
Aug 30, 2019·Nanomaterials·Jobeda J KhanamPengsu Mao
Oct 21, 2020·Small·Taewan KimJongmin Choi

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