Efficient multilayer organic solar cells using the optical interference peak

Abstract

A multilayer structure of copper phthalocyanine/poly(3-hexylthiophene-2,5-diyl): [6,6]-phenyl-C61-butyric acid methyl ester (CuPc/P3HT:PCBM) is used to extend the light absorption spectrum covering almost the entire visible spectrum. To maximize the light absorption, the total number of excitons created in the multilayer structure as a function of layer thickness of both CuPc and P3HT:PCBM is simulated by using the optical transfer matrix formalism. The solar cells with a device structure of ITO/PEDOT:PSS/CuPc/P3HT:PCBM/Al are fabricated with different layers thicknesses. The optimized solar cell with a high short circuit current density of 12.54mA∕cm2 and power conversion efficiency as high as 4.13% is achieved, owing to the utilization of the second optical interference peak in the multilayer structure for the enhanced light absorption.

Copper-phthalocyanine based metal–organic interfaces: The effect of fluorination, the substrate, and its symmetry

“…37 Previous work reported the disappearance of the Au(111) herringbone reconstruction under the F 16 CuPc monolayers. 26 However, higher quality STM measurements have now proven the opposite, revealing the substrate reconstruction under the organic overlayer with an fcc/hcp periodicity measured along the [1][2][3][4][5][6][7][8][9][10] direction of 65 ± 3 Å, thus virtually unchanged with respect to the pristine Au(111). While this could be interpreted as the result of very weak molecule-substrate interactions, 31 the reported disappearance of the Au(111) surface state upon F 16 CuPc adsorption, as measured by valence band photoelectron spectroscopy, 26 still supports the picture of a significant interaction.…”

“…31,38 CuPc on Au(111) leads to the growth of crystalline layers characterized by a square unit cell of dimensions a = 13.9 ± 0.7 Å, and it hardly affects the underlying Au(111) surface reconstruction. 30,39 The unit cell vectors are directed along the high symmetry and [1][2][3][4][5][6][7][8][9][10] directions (Fig. 4).…”

Effects of Optical Interference and Annealing on the Performance of Polymer/Fullerene Bulk Heterojunction Solar Cells

“…In order to investigate the effects of the cathode confinement on the device performance in the thermal treatment, two different types of devices were investigated: the devices without the cathode confinement in the thermal treatment (anneal the devices before the cathode deposition, pre-anneal) and the devices with the cathode confinement in the thermal treatment (anneal the devices after the cathode deposition, post-14 anneal). The thermal treatment was carried out by annealing the devices in the glove box at the optimized temperature of 160 °C for about 10 mins as our previous report [Zhang et al, 2008]. For reference, the devices without any thermal treatment were also fabricated.…”

Self-Assembly of Bicomponent Molecular Monolayers: Adsorption Height Changes and Their Consequences

“…The molecules used are copper phtalocyanine (CuPc, donor) and perfluoropentacene (PFP, acceptor), two piconjugated molecules known for their successful integration in optoelectronic devices. 15,16 The lateral order of the 2D blends and the molecule-substrate distances have been characterized using scanning tunneling microscopy (STM) and normal-incidence XSW, respectively. The former evidences highly crystalline molecular networks, in which each molecule is surrounded by the opposite species.…”