Carrier motion in as-spun and annealed P3HT:PCBM blends revealed by ultrafast optical electric field probing and Monte Carlo simulations

被引：25

作者：

Abramavicius, Vytautas ^{[1
,2
]}

Vithanage, Dimali Amarasinghe ^{[3
]}

Devizis, Andrius ^{[1
]}

Infahsaeng, Yingyot ^{[3
]}

Bruno, Annalisa ^{[4
]}

Foster, Samuel ^{[4
]}

Keivanidis, Panagiotis E. ^{[5
]}

Abramavicius, Darius ^{[2
]}

Nelson, Jenny ^{[4
]}

Yartsev, Arkady ^{[3
]}

Sundstroem, Villy ^{[3
]}

Gulbinas, Vidmantas ^{[1
]}

机构：

[1] Ctr Phys Sci & Technol, LT-02300 Vilnius, Lithuania

[2] Vilnius Univ, Dept Theoret Phys, LT-10222 Vilnius, Lithuania

[3] Lund Univ, S-22100 Lund, Sweden

[4] Univ London Imperial Coll Sci Technol & Med, London SW7 2AZ, England

[5] Ist Italiano Tecnol, Ctr Nano Sci & Technol PoliMi, I-20133 Milan, Italy

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2014年 / 16卷 / 06期

基金：

英国工程与自然科学研究理事会;

关键词：

CHARGE SEPARATION; NANOSCALE MORPHOLOGY; SOLAR-CELLS; FULLERENE; POLYMER; POLY(3-HEXYLTHIOPHENE); PERFORMANCE; GENERATION; RECOMBINATION; DEPENDENCE;

D O I：

10.1039/c3cp54605e

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：

Charge transport dynamics in solar cell devices based on as-spun and annealed P3HT:PCBM films are compared using ultrafast time-resolved optical probing of the electric field by means of field-induced second harmonic generation. The results show that charge carriers drift about twice as far during the first 3 ns after photogeneration in a device where the active layer has been thermally annealed. The carrier dynamics were modelled using Monte-Carlo simulations and good agreement between experimental and simulated drift dynamics was obtained using identical model parameters for both cells, but with different average PCBM and polymer domain sizes. The calculations suggest that small domain sizes in as-spun samples limit the carrier separation distance disabling their escape from geminate recombination.

引用

页码：2686 / 2692

页数：7

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