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Issue 6, 2015
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Facile synthesis of ultra-small PbSe nanorods for photovoltaic application

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Nanocrystal array solar cells based on lead chalcogenide quantum dots (QDs) have recently achieved a high power conversion efficiency of over 8%. The device performance is expected to further increase by using 1-dimensional nanorods (NRs), due to their improved carrier transport over zero-dimensional quantum dots. However, previously reported PbSe NRs have not been used in solar cells mainly because of their large diameters, resulting in a small bandgap unsuitable for photovoltaic application. In this work, we have demonstrated a new method for synthesizing monodisperse ultra-small PbSe NRs with the diameter approaching 2 nm (Eg > 1.2 eV), which can be attributed to the use of diphenylphosphine (DPP) and trans-2-octenoic acid (t-2-OA). The introduction of trace DPP can greatly lower the reaction temperature, leading to reduced diameters for the obtained PbSe NRs as well as largely increased yield. The use of short-chain t-2-OA together with oleic acid as capping ligands results in high monomer reactivity, fast nucleus diffusion and high growth rate, which realize the anisotropic growth of ultra-small PbSe NRs at low reaction temperatures. The PbSe NRs show n-type properties and high electron mobility as measured using field-effect transistors. The PbSe NRs with narrow diameters also demonstrate a suitable bandgap for photovoltaic application. They are used for the first time in solar cells and their improved efficiency is demonstrated when used together with QDs.

Graphical abstract: Facile synthesis of ultra-small PbSe nanorods for photovoltaic application

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Publication details

The article was received on 29 sep. 2014, accepted on 12 des. 2014 and first published on 15 des. 2014

Article type: Paper
DOI: 10.1039/C4NR05707D
Citation: Nanoscale, 2015,7, 2461-2470

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    Facile synthesis of ultra-small PbSe nanorods for photovoltaic application

    L. Han, J. Liu, N. Yu, Z. Liu, J. Gu, J. Lu and W. Ma, Nanoscale, 2015, 7, 2461
    DOI: 10.1039/C4NR05707D

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