Thin film photodiodes fabricated by electrostatic self-assembly of aqueous colloidal quantum dots

被引：5
作者：
Tu, Chang-Ching [1 ]
Lin, Lih Y. [1 ]
机构：
[1] Univ Washington, Dept Elect Engn, Seattle, WA 98195 USA
来源：
THIN SOLID FILMS | 2010年 / 519卷 / 02期
基金：
美国国家科学基金会;
关键词：
Photovoltaic cells; Photodetectors; Quantum dots; Cadmium telluride; NANOCRYSTALS; PHOTOVOLTAICS; NANOPARTICLES; SILICON;
D O I：
10.1016/j.tsf.2010.08.141
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We demonstrate a thin film photodiode structure consisting of multi layers of colloidal quantum dots (QDs) which has application in photovoltaics and photodetection The CdTe QDs with either positively or negatively charged capping ligands are self-assembled layer-by-layer on an indium tin oxide (ITO) substrate by electrostatic attraction in aqueous solution A photolithographically patterned photoresist window defines the device active area and an evaporated aluminum (Al) thin film serves as the top electrode The built-In electric field due to the work function difference between Al and ITO separates photo excited electron-hole pairs and generates photocurrent Since the ligands used for QD synthesis are short (less than 05 rim) no additional steps of ligand exchange or annealing is needed for enhancing the thin film photoconductivity Thiol passivation and self-assembly in an inert environment help reduce surface traps leading to less fermi-level pinning which also Improves the device performance (C) 2010 Elsevier B V All rights reserved
引用
收藏
页码：857 / 862
页数：6
相关论文
共 13 条
  • [1] Thiols Passivate Recombination Centers in Colloidal Quantum Dots Leading to Enhanced Photovoltaic Device Efficiency
    Barkhouse, D. Aaron R.
    Pattantyus-Abraham, Andras G.
    Levina, Larissa
    Sargent, Edward H.
    [J]. ACS NANO, 2008, 2 (11) : 2356 - 2362
  • [2] (CdSe)ZnS core-shell quantum dots: Synthesis and characterization of a size series of highly luminescent nanocrystallites
    Dabbousi, BO
    RodriguezViejo, J
    Mikulec, FV
    Heine, JR
    Mattoussi, H
    Ober, R
    Jensen, KF
    Bawendi, MG
    [J]. JOURNAL OF PHYSICAL CHEMISTRY B, 1997, 101 (46) : 9463 - 9475
  • [3] Thiol-capping of CdTe nanocrystals:: An alternative to organometallic synthetic routes
    Gaponik, N
    Talapin, DV
    Rogach, AL
    Hoppe, K
    Shevchenko, EV
    Kornowski, A
    Eychmüller, A
    Weller, H
    [J]. JOURNAL OF PHYSICAL CHEMISTRY B, 2002, 106 (29) : 7177 - 7185
  • [4] Air-stable all-inorganic nanocrystal solar cells processed from solution
    Gur, I
    Fromer, NA
    Geier, ML
    Alivisatos, AP
    [J]. SCIENCE, 2005, 310 (5747) : 462 - 465
  • [5] Efficient Schottky-quantum-dot photovoltaics: The roles of depletion, drift, and diffusion
    Johnston, Keith W.
    Pattantyus-Abraham, Andras G.
    Clifford, Jason P.
    Myrskog, Stefan H.
    Hoogland, Sjoerd
    Shukla, Harnik
    Klem, Ethan J. D.
    Levina, Larissa
    Sargent, Edward H.
    [J]. APPLIED PHYSICS LETTERS, 2008, 92 (12)
  • [6] Schottky Solar Cells Based on Colloidal Nanocrystal Films
    Luther, Joseph M.
    Law, Matt
    Beard, Matthew C.
    Song, Qing
    Reese, Matthew O.
    Ellingson, Randy J.
    Nozik, Arthur J.
    [J]. NANO LETTERS, 2008, 8 (10) : 3488 - 3492
  • [7] Structural, optical and electrical properties of self-assembled films of PbSe nanocrystals treated with 1,2-ethanedithiol
    Luther, Joseph M.
    Law, Matt
    Song, Qing
    Perkins, Craig L.
    Beard, Matthew C.
    Nozik, Arthur J.
    [J]. ACS NANO, 2008, 2 (02) : 271 - 280
  • [8] Doping for Speed: Colloidal Nanoparticles for Thin-Film Optoelectronics
    Noone, Kevin M.
    Ginger, David S.
    [J]. ACS NANO, 2009, 3 (02) : 261 - 265
  • [9] Infrared photovoltaics made by solution processing
    Sargent, Edward H.
    [J]. NATURE PHOTONICS, 2009, 3 (06) : 325 - 331
  • [10] Dependence of indium-tin-oxide work function on surface cleaning method as studied by ultraviolet and x-ray photoemission spectroscopies
    Sugiyama, K
    Ishii, H
    Ouchi, Y
    Seki, K
    [J]. JOURNAL OF APPLIED PHYSICS, 2000, 87 (01) : 295 - 298
12