Understanding the Thickness-Dependent Performance of Organic Bulk Heterojunction Solar Cells: The Influence of Mobility, Lifetime, and Space Charge

被引：232

作者：

Kirchartz, Thomas ^{[1
,2
]}

Agostinelli, Tiziano ^{[1
,2
]}

Campoy-Quiles, Mariano ^{[3
]}

Gong, Wei ^{[1
,2
,4
,5
]}

Nelson, Jenny ^{[1
,2
]}

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Dept Phys, London SW7 2AZ, England

[2] Univ London Imperial Coll Sci Technol & Med, Ctr Plast Elect, London SW7 2AZ, England

[3] Inst Ciencia Mat Barcelona, Bellaterra 08193, Spain

[4] Beijing Jiaotong Univ, Key Lab Luminescence & Opt Informat, Minist Educ, Beijing 100044, Peoples R China

[5] Beijing Jiaotong Univ, Inst Optoelect Technol, Beijing 100044, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2012年 / 3卷 / 23期

关键词：

OPEN-CIRCUIT VOLTAGE; PHOTOVOLTAIC DEVICES; CARRIER TRANSPORT; RECOMBINATION; PHOTOCURRENT; ABSORPTION; POLYMERS; DETERMINANT; FULLERENE; DENSITY;

D O I：

10.1021/jz301639y

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：

We investigate the reasons for the dependence of photovoltaic performance on the absorber thickness of organic solar cells using experiments and drift-diffusion simulations. The main trend in photocurrent and fill factor versus thickness is determined by mobility and lifetime of the charge carriers. In addition, space charge becomes more and more important the thicker the device is because it creates field free regions with low collection efficiency. The two main sources of space-charge effects are doping and asymmetric mobilities. We show that for our experimental results on Si-PCPDTBT:PC71BM (poly[(4,40-bis(2-ethylhexyl)dithieno[3,2-b:20,30-d]silole)-2,6-diyl-alt-(4,7-bis(2-thienyl)-2,1,3-benzothiadiazole)-5,50-diyl]:[6,6]-phenyl C71-butyric acid methyl ester) solar cells, the influence of doping is most likely the dominant influence on the space charge and has an important effect on the thickness dependence of performance.

引用

页码：3470 / 3475

页数：6

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