title: Dry-Deposited Transparent Carbon Nanotube Film as Front Electrode in Colloidal Quantum Dot Solar Cells.
abstract: Single-walled carbon nanotubes (SWCNTs) show great potential as an alternative material for front electrodes in photovoltaic applications, especially for flexible devices. In this work, a press-transferred transparent SWCNT film was utilized as front electrode for colloidal quantum dot solar cells (CQDSCs). The solar cells were fabricated on both glass and flexible substrates, and maximum power conversion efficiencies of 5.5 and 5.6 %, respectively, were achieved, which corresponds to 90 and 92 % of an indium-doped tin oxide (ITO)-based device (6.1 %). The SWCNTs are therefore a very good alternative to the ITO-based electrodes especially for flexible solar cells. The optical electric field distribution and optical losses within the devices were simulated theoretically and the results agree with the experimental results. With the optical simulations that were performed it may also be possible to enhance the photovoltaic performance of SWCNT-based solar cells even further by optimizing the device configuration or by using additional optical active layers, thus reducing light reflection of the device and increasing light absorption in the quantum dot layer.
authors.affiliation: Department of Chemistry-Ångström Laboratory, Physical Chemistry, Uppsala University, 75120, Uppsala, Sweden.
authors.forename: Xiaoliang
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Department of Chemistry-Ångström Laboratory, Physical Chemistry, Uppsala University, 75120, Uppsala, Sweden.
authors.forename: Kerttu
authors.initials: K
authors.lastname: Aitola
authors.affiliation: Department of Engineering Sciences, Solid State Electronics, Uppsala University, 75121, Uppsala, Sweden.
authors.forename: Carl
authors.initials: C
authors.lastname: Hägglund
authors.affiliation: Department of Applied Physics, Nanomaterials Group, Aalto University, P.O. Box 15100, FI-00076, Aalto, Espoo, Finland.
authors.forename: Antti
authors.initials: A
authors.lastname: Kaskela
authors.affiliation: Department of Chemistry-Ångström Laboratory, Physical Chemistry, Uppsala University, 75120, Uppsala, Sweden.
authors.forename: Malin B
authors.initials: MB
authors.lastname: Johansson
authors.affiliation: Department of Chemistry-Ångström Laboratory, Physical Chemistry, Uppsala University, 75120, Uppsala, Sweden.
authors.forename: Kári
authors.initials: K
authors.lastname: Sveinbjörnsson
authors.affiliation: Department of Applied Physics, Nanomaterials Group, Aalto University, P.O. Box 15100, FI-00076, Aalto, Espoo, Finland.
authors.forename: Esko I
authors.initials: EI
authors.lastname: Kauppinen
authors.affiliation: Department of Chemistry-Ångström Laboratory, Physical Chemistry, Uppsala University, 75120, Uppsala, Sweden.
authors.forename: Erik M J
authors.initials: EM
authors.lastname: Johansson
mesh_terms: D003102:Colloids; D004396:Coloring Agents / Q000737:chemistry*; D011211:Electric Power Supplies; D004566:Electrodes; D037742:Nanotubes, Carbon / Q000737:chemistry*; D055620:Optical Phenomena; D045663:Quantum Dots / Q000737:chemistry*; D012993:Solar Energy; D017971:Tin Compounds / Q000737:chemistry
chemical_list: D003102:Colloids; D004396:Coloring Agents; D037742:Nanotubes, Carbon; D017971:Tin Compounds; C109984:indium tin oxide
keywords: carbon nanotubes; colloidal quantum dots; electrodes; optical loss; solar cells