Abstract
Graphene oxide/single-wall carbon nanotube (GOCNT) hybrid films have been used to fabricate heterojunction solar cells with silicon (Si) due to their compatibility with both aqueous and organic processing.
Highlights
Carbon nanomaterial based transparent conducting lms are a potential alternative to replace the currently used transparent conductive oxides which present several drawbacks[1] including scarcity of indium,[2] their brittle structure,[3] instability in acid environments and high production costs.[4]
The S11 peak remains and a wide absorption feature above 1000 nm is observed a er the hybridization of Graphene oxide/single-wall carbon nanotube (GOCNT) with AgNWs, which indicates the existence of AgNWs in the electrode and suggests they may not have a p-type doping effect on Carbon nanotubes (CNTs).[59]
Both S11 and S22 peaks are suppressed to various extents a er GOCNT lms are treated with p-type dopants,[60] which is a result of the shi of the Fermi level of CNTs into the valence band with electrons transferred from CNTs to dopants.[61]
Summary
Carbon nanomaterial based transparent conducting lms are a potential alternative to replace the currently used transparent conductive oxides (such as indium doped tin oxide, ITO) which present several drawbacks[1] including scarcity of indium,[2] their brittle structure,[3] instability in acid environments and high production costs.[4]. Graphene oxide (GO) has been shown to be able to both help to disperse CNTs in water and enhance the aqueous compatibility of the as-prepared lm due to its amphiphilic nature.[22,23,24,25] Such hybrid lms made with GO and CNTs (GOCNTs) have been used as transparent window electrodes and applied on silicon to fabricate graphene oxide carbon nanotube/silicon heterojunction solar cells (GOCNT/Si).[26] Brie y, in a typical device formed with p-type GOCNT lms as the window electrode and an n-type silicon base, the silicon is the light absorbing layer which produces excitons. The thin silicon oxide layer between Si and GOCNTs improves the device performance via a reduction in the reverse saturation current.[38] In these solar cells, devices made with the as-deposited CNT lms typically show mediocre performance due to high sheet resistance and low native p-doping. Both the efficiency and the stability of the devices were studied and compared
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