Balanced Carrier Mobilities: Not a Necessary Condition for High-Efficiency Thin Organic Solar Cells as Determined by MIS- CELIV

被引：136
作者：
Armin, Ardalan [1 ,2 ]
Juska, Gytis [3 ]
Ullah, Mujeeb [1 ,2 ]
Velusamy, Marappan [1 ,2 ]
Burn, Paul L. [1 ,2 ]
Meredith, Paul [1 ,2 ]
Pivrikas, Almantas [1 ,2 ]
机构：
[1] Univ Queensland, Sch Chem & Mol Biosci, Ctr Organ Photon & Elect, Brisbane, Qld 4072, Australia
[2] Univ Queensland, Sch Math & Phys, Brisbane, Qld 4072, Australia
[3] Vilnius Univ, Dept Solid State Elect, LT-10222 Vilnius, Lithuania
来源：
ADVANCED ENERGY MATERIALS | 2014年 / 4卷 / 04期
基金：
澳大利亚研究理事会;
关键词：
organic solar cells; charge carrier mobility; field-effect transistors; internal quantum efficiency; INTERNAL QUANTUM EFFICIENCY; CHARGE-TRANSPORT; RECOMBINATION; PERFORMANCE; LIFETIME; ELECTRON;
D O I：
10.1002/aenm.201300954
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A novel technique based upon injection-charge extraction by linearly increasing voltage (i-CELIV) in a metal-insulator-semiconductor (MIS) diode structure is described for studying charge transport in organic semiconductors. The technique (MIS-CELIV) allows selective measurement of both electron and hole mobilities of organic solar cells with active layers thicknesses representative of operational devices. The method is used to study the model high efficiency bulk heterojunction combination poly[N-9-heptadecanyl-2,7-carbazole-alt-5,5-(4,7-di-2-thienyl-2,1,3-benzothiadiazole)] (PCDTBT) and [6,6]-phenyl C70-butyric acid methyl ester (PC70BM) at various blend ratios. The absence of bipolar transport in PCDTBT-and-PC70BM-only diodes is shown and strongly imbalanced carrier mobility is found in the most efficient optimized blend ratios. The mobility measurements are correlated with overall device performance and it is found that balanced and high charge carrier mobility are not necessarily required for high efficiencies in thin film organic solar cells.
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页数：8
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