Near-infrared photodetection based on PbS colloidal quantum dots/organic hole conductor

被引：26

作者：

Im, Sang Hyuk ^{[1
]}

Chang, Jeong Ah ^{[1
]}

Kim, Sung Woo ^{[2
]}

Kim, Sang-Wook ^{[2
]}

Seok, Sang Il ^{[1
]}

机构：

[1] Korea Res Inst Chem Technol, Adv Mat Div, KRICT EPFL Global Res Lab, Taejon 305600, South Korea

[2] Ajou Univ, Dept Mol Sci & Technol, Suwon 443749, South Korea

来源：

ORGANIC ELECTRONICS | 2010年 / 11卷 / 04期

关键词：

Near-infrared; Photodetection; PbS colloidal quantum dots; Organic hole conductor; Nanoporous TiO2;

D O I：

10.1016/j.orgel.2009.12.021

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have developed Near-infrared (NIR)-sensitive heterojunction cells consisting of n-type PbS colloidal quantum dots (CQDs) (low bandgap) anchored on the nanoporous TiO2 (np-TiO2, high-bandgap), and p-type spiro-OMeTAD (2,2',7,7'-tetrakis(N, N-di-p-methoxyphenylamine)9,9'-spirobifluorene). In these cells, an n-type np-TiO2 layer acts both as a host that chemically binds to the PbS CQDs and as an electron carrier. The number of PbS CQDs loaded onto the np-TiO2 layer not only increases the external quantum efficiency (EQE) but also reduces the response time in the NIR region. The performance of these devices increased upon the introduction of a TiOx layer between the PbS CQDs and spiro-OMeTAD followed by heat treatment at 110 degrees C for 1 min. (C) 2009 Elsevier B. V. All rights reserved.

引用

页码：696 / 699

页数：4

共 18 条

[1] Organic photodetector with spectral response tunable across the visible spectrum by means of internal optical microcavity [J].

An, Kwang Hyup ;

O'Connor, Brendan ;

Pipe, Kevin P. ;

Shtein, Max .

ORGANIC ELECTRONICS, 2009, 10 (06) :1152-1157

[2] Efficient solution-processed hybrid polymer-nanocrystal near infrared light-emitting devices [J].

Choudhury, Kaushik Roy ;

Song, Dong Woo ;

So, Franky .

ORGANIC ELECTRONICS, 2010, 11 (01) :23-28

[3] Efficient photoconductive devices at infrared wavelengths using quantum dot-polymer nanocomposites [J].

Choudhury, KR ;

Sahoo, Y ;

Ohulchanskyy, TY ;

Prasad, PN .

APPLIED PHYSICS LETTERS, 2005, 87 (07)

[4] Fast, sensitive and spectrally tuneable colloidal quantum-dot photodetectors [J].

Clifford, Jason P. ;

Konstantatos, Gerasimos ;

Johnston, Keith W. ;

Hoogland, Sjoerd ;

Levina, Larissa ;

Sargent, Edward H. .

NATURE NANOTECHNOLOGY, 2009, 4 (01) :40-44

[5] Nanoparticle-based, spray-coated silver top contacts for efficient polymer solar cells [J].

Girotto, Claudio ;

Rand, Barry P. ;

Steudel, Soeren ;

Genoe, Jan ;

Heremans, Paul .

ORGANIC ELECTRONICS, 2009, 10 (04) :735-740

[6]

Hinds S., 2008, Adv. Mater, V20, P1

[7] Colloidal PbS nanocrystals with size-tunable near-infrared emission: Observation of post-synthesis self-narrowing of the particle size distribution [J].

Hines, MA ;

Scholes, GD .

ADVANCED MATERIALS, 2003, 15 (21) :1844-1849

[8] Comparison of Dye- and Semiconductor-Sensitized Porous Nanocrystalline Liquid Junction Solar Cells [J].

Hodes, Gary .

JOURNAL OF PHYSICAL CHEMISTRY C, 2008, 112 (46) :17778-17787

[9] Electron Injection from Colloidal PbS Quantum Dots into Titanium Dioxide Nanoparticles [J].

Hyun, Byung-Ryool ;

Zhong, Yu-Wu. ;

Bartnik, Adam C. ;

Sun, Liangfeng ;

Abruna, Hector D. ;

Wise, Frank W. ;

Goodreau, Jason D. ;

Matthews, James R. ;

Leslie, Thomas M. ;

Borrelli, Nicholas F. .

ACS NANO, 2008, 2 (11) :2206-2212

[10] Efficient Schottky-quantum-dot photovoltaics: The roles of depletion, drift, and diffusion [J].

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. .

APPLIED PHYSICS LETTERS, 2008, 92 (12)

← 1 2 →