Photocurrent Enhancement by Introducing Gold Nanoparticles in Nanostructures Based Heterojunction Solar Cell Device

Abstract

In this paper, we report a first hand study of plasmon-enhanced photocurrent observed in hybrid nanostructures based heterojunction solar cell. The heterojunction solar cell was fabricated, using chemically synthesized narrow gap, IV-VI group semiconductor nanoparticles (PbS) of 3∼6nm diameter, wide gap semiconductor ZnO nanowires of 500nm∼1 μm length and ∼50nm diameter, and gold nanoparticles (∼5nm to 30nm), by spin-coating (∼20cycles) onto FTO glasses, in ambient conditions (25°C, 1atm). The synthesized nanostructures were characterized by XRD, UV-VIS absorption, SEM, TEM, solar simulator, etc. Nanostructures of variant sizes were integrated in to the heterojunction devices to study the effects on photocurrent and solar cell performance. The sizes, lengths, thickness of nanostructures were optimized to have best solar cell devices. The effects of fabrication conditions (such as growth temperature, growth time, anneal temperature, ligand treatments, in air or in N2, etc.) on device performance were also studied. The architecture of film stack, i.e., the positions of Au nanoparticles and PbS nanoparticles were also studied. It was confirmed that introducing Au nanopartiles with proper size would lead to the increase of photocurrent. The key challenges were to minimize the trap states and optimize the interface of nanostructures.

Magnetic Field Dependence of Excitonic and Optical Properties of InP/ZnS Core/Shell Nanostructure

“…Core/shell quantum dot semiconductors can be employed in many potential applications, such as blue-emitting devices, photovoltaics, photosensitized solar cells, and light-emitting diodes. [12][13][14][15] Among the group III-V and group II-VI compound semiconducting materials, InP/ZnS compounds are emerging as promising candidates to replace cadmium-based materials in applications, thus eliminating their toxicity. Many researchers have concentrated on the synthesis of high-quality InP/ ZnS nanocrystals due to their superior application potential.…”

Heterogeneous Nanostructures Fabricated via Binding Energy-Controlled Nanowelding

“…Nanostructures synthesized by chemicals including the most common Ag and Au nanowires and nanoparticles have been applied in transparent electrodes, − touch screens, , and sensors . On the other hand, some composite nanostructures fabricated via e-beam lithography, evaporation, chemical synthesis, and special nanotransfer techniques have been applied in photocatalysis, solar cells, and energy harvesting . The fabrication of these complex composite nanostructures is challenging, which impedes their improvements in applicability and efficacy.…”