Imprinted large-scale high density polymer nanopillars for organic solar cells

Nanoimprint with a large-scale nanoporous Si mold is developed to fabricate high density periodic nanopillars (∼1010∕cm2) in various functional polymers. A anodic alumina membrane is first obtained using electrochemical anodization. The membrane is used as a mask for a two-step plasma etching process to obtain a Si mold of 50–80nm wide and 100–900nm deep pores. The mold is used in nanoimprint lithography to fabricate ordered and high density polymer nanopillars and nanopores in SU-8, hydrogen silsesquixane, polymethylmethacrylate, poly(3-hexylthiophane) (P3HT), and phenyl-C61-butyric acid methyl ester (PCBM). Then, the imprinted P3HT nanopillars were used to make bulk heterojunction solar cells by depositing PCBM on top of the pillars. Imprinting provides a way to precisely control the interdigitized heterojunction morphology, leading to improved solar cell performance.

[1]  Joseph M DeSimone,et al.  Direct fabrication and harvesting of monodisperse, shape-specific nanobiomaterials. , 2005, Journal of the American Chemical Society.

[2]  R. C. Furneaux,et al.  The formation of controlled-porosity membranes from anodically oxidized aluminium , 1989, Nature.

[3]  L. J. Guo,et al.  Nanoimprint Lithography: Methods and Material Requirements , 2007 .

[4]  David G Lidzey,et al.  Nanoscale conjugated-polymer light-emitting diodes. , 2005, Nano letters.

[5]  Stephen Y. Chou,et al.  Imprint of sub-25 nm vias and trenches in polymers , 1995 .

[6]  T. Tamamura,et al.  Ordered Mosaic Nanocomposites in Anodic Porous Alumina , 2003 .

[7]  A. Walker,et al.  Dynamical Monte Carlo modelling of organic solar cells: the dependence of internal quantum efficiency on morphology. , 2005, Nano letters.

[8]  I. Vlassiouk,et al.  "Direct" detection and separation of DNA using nanoporous alumina filters. , 2004, Langmuir : the ACS journal of surfaces and colloids.

[9]  Toshiaki Tamamura,et al.  Highly ordered nanochannel-array architecture in anodic alumina , 1997 .

[10]  Supriyo Bandyopadhyay.  Self-assembled nanoelectronic quantum computer based on the Rashba effect in quantum dots , 2000 .

[11]  C. R. Martin,et al.  Nanowell-array surfaces prepared by argon plasma etching through a nanopore alumina mask. , 2005, Langmuir : the ACS journal of surfaces and colloids.

[12]  K. Bussman,et al.  Nanoscale organic light-emitting diodes. , 2005, Nano letters.

[13]  Victor M. Burlakov,et al.  A numerical model for explaining the role of the interface morphology in composite solar cells , 2007 .

[14]  Elazer R. Edelman,et al.  Adv. Drug Delivery Rev. , 1997 .

[15]  Soo Jin Chua,et al.  Fabrication and properties of nanoporous GaN films , 2004 .

[16]  R. Beresford,et al.  A growth pathway for highly ordered quantum dot arrays , 2004 .

[17]  David T. Crouse,et al.  Self-ordered pore structure of anodized aluminum on silicon and pattern transfer , 2000 .

[18]  Soo Jin Chua,et al.  Nonlithographic nanopatterning through anodic aluminum oxide template and selective growth of highly ordered GaN nanostructures , 2006 .

[19]  宁北芳,et al.  疟原虫var基因转换速率变化导致抗原变异[英]／Paul H, Robert P, Christodoulou Z, et al//Proc Natl Acad Sci U S A , 2005 .

[20]  Max Shtein,et al.  Flexible conjugated polymer photovoltaic cells with controlled heterojunctions fabricated using nanoimprint lithography , 2007 .

[21]  G. C. Wood,et al.  The anodizing of aluminium in sulphate solutions , 1970 .

[22]  Shaochen Chen,et al.  Micro and nano-fabrication of biodegradable polymers for drug delivery. , 2004, Advanced drug delivery reviews.

[23]  Kenji Fukuda,et al.  Ordered Metal Nanohole Arrays Made by a Two-Step Replication of Honeycomb Structures of Anodic Alumina , 1995, Science.

[24]  T. Tamamura,et al.  Photonic Band Gap in Anodic Porous Alumina with Extremely High Aspect Ratio Formed in Phosphoric Acid Solution , 2000 .