Cover Page September-2018-Advanced Materials Letters

Advanced Materials Letters

Volume 9, Issue 9, Pages 629-631, September 2018
About Cover


Work function and induced band bending characterization for engineering of selective contact for solar cells

Marshall Wilson1*, Alexandre Savtchouk1, Ziv Hameiri2, Jie Cui3 and Jacek Lagowski1

1Semilab SDI, Tampa, FL 33617, USA

2University of New South Wales (UNSW), Sydney NSW 2052, Australia

3Australian National University (ANU), Canberra ACT 0200, Australia

Adv. Mater. Lett., 2018, 9 (9), pp 629-631

DOI: 10.5185/amlett.2018.2084

Publication Date (Web): Jun 14, 2018

E-mail: mwilson@semilabsdi.com

Abstract

This work demonstrates the effectiveness of non-contact Kelvin-probe and surface photovoltage characterization of the work function (WF) induced barriers formed in silicon (Si) by thin 5nm carrier selective contact films of MoOx, TiO2 and MgF2.  The calibrated Kelvin probe in the dark and under strong illumination where used to determine the dark WF of the deposited films and the band bending in the Si, FBB = WFDark – WFLight.  The ac-surface photo voltage provided an independent measurement of the Si depletion layer width.  Whole wafer mapping of all parameters can be performed.  For n-type Si the high work function oxides MoOx (WF~5.7eV) and TiO2 (WF~5.0eV) are found to induce a depletion barrier with the height increasing with WF as FBB[eV] = 0.23WF – 0.77, i.e. quite similar to the well-known relationship for metal-silicon contacts.  For the low work function MgF2 film, a depletion barrier was induced only in p-type Si.  For this case, full wafer mapping revealed a lower WF pattern coinciding with larger band bending giving the slope, DFBB/DWF ~ -0.52.  The slopes of 0.23 and 0.52 for n- and p-type Si deviates significantly from the ideal slope of 1.  This result implies that the barrier formation at the Film-Si heterojunction is limited by the effect of interfacial layers and interface states in analogy to the well-known effects in Metal-Si contacts. It is believed that this demonstrated very fast, preparation-free, non-contact characterization technique can benefit research and engineering of selective contacts for solar cells. 

Keywords

Solar cell, work function, band bending, hole selective contacts, electron selective contacts.

Current Issue

Cloud Medicine set to Revolutionize Doorstep Personalized Healthcare


Various surfactants for 0 – 3 dimensional nanocarbons: Separation, exfoliation and solubilization


Polypyrrole based biofunctional composite layer for bioelectrocatalytic device system


Innovative Graphene-PDMS sensors for aerospace applications 


Effect of hot drawing process and carbonization temperature in electrochemical behavior of electrospun carbon nanofibers


Chemical Reactivity and Electronical Properties of Graphene and Reduced Graphene Oxide on Different Substrates


Laser Raman micro-spectroscopy as an effective non-destructive method of detection and identification of various sp2 carbon modifications in industry and in nature


Electrochemical promotion of ammonia synthesis with proton-conducting solid oxide fuel cells


Biomimetic surfaces with hierarchical structure using microsized texture and nanosized Cu particles for superhydrophobicity


Enhancement the properties of high and low-density polyethylene membranes by radiation grafting process


Synthesis of 9-Aminoacridine and its Application as an Anode Material for Aqueous Rechargeable Lithium–ion Batteries


Facile synthesis of novel tough and highly flexible biodegradable membranes for water microfiltration


Investigating the possibility of using acetic acid in place of HF in chromium-benzenedicarboxylates (MIL-53 and MIL-101) synthesis applicable for CO2 adsorption


Previous issues

Smart Healthcare pulls up Clouds for Virtual Medicine

Selecting the correct electromagnetic inspection technology 

Influence of railway-track grinding on the track material condition and tribological behaviour

Micromechanical Fatigue Modelling of the Size Effect in Micro-Scale 316L Stainless Steel Specimens

Functionalization of Graphene and Reduced Graphene Oxide in Different Matrices

Effect of parasitic polytypes on ballistic electron transport in chemical vapor deposition grown 6H-SiC epitaxial layers

Photomemristive heterostructures based on two-dimensional crystals

Architecture - behaviour - properties relationship in Star-shaped MPA-PMMA and MPA-PS hyper-branched copolymers

Graphene and doped graphene: A comparative DFT study

Ag2CO3 / Magnetic reduced graphene oxide nanocomposite as advanced visible light photocatalytic hybrid materials for efficient degradation of azo dye

Optimization of acid hydrolysis process for the preparation cellulose nanofibrils

Alginate/k-carrageenan and alginate/gelatin composite hydrogel beads for controlled drug release of curcumin

Study of microstructure and mechanical properties of friction stir welded ferrite-martensite DP700 steel

Upcoming Congress

Knowledge Experience at Sea TM