High Photoelectric Conversion Efficiency of Metal Phthalocyanine/Fullerene Heterojunction Photovoltaic Device

Abstract

This paper introduces the fundamental physical characteristics of organic photovoltaic (OPV) devices. Photoelectric conversion efficiency is crucial to the evaluation of quality in OPV devices, and enhancing efficiency has been spurring on researchers to seek alternatives to this problem. In this paper, we focus on organic photovoltaic (OPV) devices and review several approaches to enhance the energy conversion efficiency of small molecular heterojunction OPV devices based on an optimal metal-phthalocyanine/fullerene (C60) planar heterojunction thin film structure. For the sake of discussion, these mechanisms have been divided into electrical and optical sections: (1) Electrical: Modification on electrodes or active regions to benefit carrier injection, charge transport and exciton dissociation; (2) Optical: Optional architectures or infilling to promote photon confinement and enhance absorption.

Improvement in the open-circuit voltage of an organic photovoltaic device through selection of a suitable and low-lying highest occupied molecular orbital for the electron donor layer

“…43 As the device is operated close to the short-circuit condition, the photocurrent is dominated by a diffusion mechanism rather than drift transport due to the absence of large amounts of injection current. 44 When we operate the OPV with an applied voltage near the V OC , competition between the injection and diffusion currents occurred. In this case, the distribution profile of the electric field into the OPV may decrease, and the injection current will correspondingly be reduced as the thickness is increased.…”

Tailoring Dispersion and Aggregation of Au Nanoparticles in the BHJ Layer of Polymer Solar Cells: Plasmon Effects versus Electrical Effects

“…[41,42] The shunt resistance, which refers to a loss in photocurrent due to carrier recombination within the device, particularly at the interfaces between each layer, was also influenced by the interfacial contact between the BHJ layer and Al cathode. [43] According to Table 1, the shunt resistance of device A was more than two times higher than the values obtained for device B and C. From Figure 3, it can be noted that the surface of the BHJ film in device A was rougher than that of the neat BHJ film but smoother than those of the other BHJ films with Au NPs. In the case of the BHJ films of devices B and C, several spikes in the surface height were observed due to aggregated Au NPs in the thin BHJ layer.…”

Roughness characterization of silver oxide anodes for use in efficient top-illuminated organic solar cells

“…Organic solar cells (OSCs) are a candidate that have shown particular promise, ever since the breakthrough in creating high efficiency devices by Tang [1] in 1986. Today, researchers continue struggling to improve power conversion efficiency (PCE) through the use of new materials, structural innovations, and optical engineering [2][3][4][5]. Typically, OSCs have been constructed on an indium-tin-oxide (ITO) anode due to its high transparency, high work function (^), and good conductivity, etc.…”