EXSS Quantum Photovoltaics Hot Carriers in Strain Balanced Quantum Well Solar Cells M. F. Führer, J.P. Connolly, M. Mazzer, I. M. Ballard, D.C. Johnson,

Slides:



Advertisements
Similar presentations
Nanoscale Photovoltaics
Advertisements

CHAPTER 4 CONDUCTION IN SEMICONDUCTORS
2003/04/071 Characteristic of 850-nm InGaAs/AlGaAs Vertical-Cavity Surface-Emitting Lasers Master’s thesis of Yuni Chang Speaker:Han-Yi Chu National Changhua.
PRESENTED BY: PROF. S. Y. MENSAH F.A.A.S; F.G.A.A.S UNIVERSITY OF CAPE COAST, GHANA.
Solar Cells as Light Emitters: The Key to Record Efficiencies and Approaching the Shockley-Queiser Limits OSA FiO 2013 / LS XXIX Owen Miller*: Post-doc,
The Role of Solar Electricity in Sustainable Building (Smart Windows) Quantum Photovoltaic Group Keith Barnham, Ian Ballard, Andreas Ioannides, David Johnson,
Franco-Israel Conference on Nanocharacterization Surface Electronic Characterization with SPM Sidney Cohen This presentation will probably involve audience.
Conclusions and Acknowledgements Theoretical Fits Novel Materials for Heat-Based Solar Cells We are studying a set of materials that may be useful for.
Electrical Techniques MSN506 notes. Electrical characterization Electronic properties of materials are closely related to the structure of the material.
1 st Young North Sea CCS Researchers meeting, 18 June 2014, Rotterdam 1Abidoye Luqman K. Abidoye
Luminescent Solar Concentrators: Nanorods and Raytrace Modeling R.Bose, D.J.Farrell, A.J.Chatten, A.Büchtemann, J.Quilitz, A.Fiore, L.Manna and K.W.J.Barnham.
Strain-Balanced Quantum Well Solar Cells From Multi-Wafer Production Jessica Adams 33 rd IEEE Photovoltaic Specialists Conference 12 th May 2008.
Space-Separated Quantum Cutting Anthony Yeh EE C235, Spring 2009.
EE 230: Optical Fiber Communication Lecture 11 From the movie Warriors of the Net Detectors.
Solar Cell Operation Key aim is to generate power by:
Studies of Minority Carrier Recombination Mechanisms in Beryllium Doped GaAs for Optimal High Speed LED Performance An Phuoc Doan Department of Electrical.
9. Semiconductors Optics Absorption and gain in semiconductors Principle of semiconductor lasers (diode lasers) Low dimensional materials: Quantum wells,
Amino acid interactions with varying geometry gold nanoparticles Hailey Cramer Mentored by Dr. Shashi Karna To develop the potential biomedical applications.
Nanoscale Energy Conversion in the Quantum Well Solar Cell Keith Barnham, Ian Ballard, Amanda Chatten, Dan Farrell, Markus Fuhrer, Andreas Ioannides, David.
Lesson 24: Photocell Electrical Characteristic and Circuit Model ET 332a Dc Motors, Generators and Energy Conversion Devices 1Lesson a.pptx.
Stretched exponential transport transients in GaP alloys for high efficiency solar cells Dan Hampton and Tim Gfroerer, Davidson College, Davidson, NC Mark.
ITOH Lab. Hiroaki SAWADA
Fig 2a: Illustration of macroscopic defects Diffusion lengths are calculated by the equation where μ is the mobility of electron with literature value.
(Deep Level Transient Spectroscopy) II. Advanced Techniques
ECE 340 Lecture 27 P-N diode capacitance
Presented to: Presented by:
When defects are present in a semiconductor, intermediate energy levels are formed allowing carriers to “step” down to lower energy levels and recombine.
Charge Carrier Related Nonlinearities
CHAPTER TWO THE PHOTOVOLTAIC EFFECT 2e A G.I. Module Energie Solaire Copyright, 2006 © Ahmed S. Bouazzi المدرسة الوطنية للمهندسين بتونس.
While lattice-matched Ga 0.51 In 0.49 P on GaAs has the ideal bandgap for the top converter in triple- junction GaAs-based solar cells, more complex designs.
Using molecules to capture solar energy
Convective Feedback: Its Role in Climate Formation and Climate Change Igor N. Esau.
A Comparison between Electroluminescence Models and Experimental Results D. H. Mills 1*, F. Baudoin 2, G. Chen 1, P. L. Lewin 1 1 University of Southampton,
Reconstruction PDF in Inhomogeneous Ice Ribordy & Japaridze Université de Mons-Hainaut AMANDA/ICECUBE Berkeley – March '05.
SAINT-PETERSBURG STATE UNIVERSITY EXPERIMENTAL STUDY OF SPIN MEMORY IN NANOSTRUCTURES ROMAN V. CHERBUNIN.
Ben Browne © Imperial College LondonPage 1 B.C. Browne, A. Ioannides, J.P.Connolly, K.W.J.Barnham Imperial College London John Roberts, Geoff Hill, Rob.
Jan-Gustav Werthen 1 st CPV China & 4 th International CPV Workshop September 17 – 18, 2012 JDSU 6” Wafer CPV Cells.
Mapping free carrier diffusion in GaAs with radiative and heat- generating recombination Tim Gfroerer and Ryan Crum Davidson College, Davidson, NC with.
Ch 140 Lecture Notes #13 Prepared by David Gleason
1/41 Electronic Noise Spectroscopy of InGaAs QDs Tim Morgan.
Advanced Photocathode Development Klaus Attenkofer & cathode development group ANL.
ECEE 302: Electronic Devices
Liping Yu , Alex Zunger PHYSICAL REVIEW LETTERS 108, (2012)
日 期: 指導老師:林克默、黃文勇 學 生:陳 立 偉 1. Outline 1.Introduction 2.Experimental 3.Result and Discussion 4.Conclusion 2.
Nanotechnology Application for Solar Cells: Using Quantum Dots to Modify Absorption Properties QUANTUM NANOS INC.
President UniversityErwin SitompulSDP 4/1 Lecture 4 Semiconductor Device Physics Dr.-Ing. Erwin Sitompul President University
Photoluminescence and Photocurrent in a Blue LED Ben Stroup & Timothy Gfroerer, Davidson College, Davidson, NC Yong Zhang, University of North Carolina.
Atomic transitions and electromagnetic waves
Optoelectronics.
Part V. Solar Cells Introduction Basic Operation Mechanism
Photovoltaic effect and cell principles. 1. Light absorption in materials and excess carrier generation Photon energy h = hc/ (h is the Planck constant)
Defect-related trapping and recombination in metamorphic GaAs 0.72 P 0.28 grown on GaAs Tim Gfroerer, Peter Simov, and Brant West, Davidson College, Davidson,
Saturable absorption and optical limiting
Carrier generation and recombination A sudden increase in temperature increases the generation rate. An incident burst of photons increases the generation.
Thermally activated radiative efficiency enhancement in a GaAs/GaInP heterostructure* Brant West and Tim Gfroerer, Davidson College Mark Wanlass, National.
G. Kartopu*, A.K. Gürlek, A.J. Clayton, S.J.C. Irvine Centre for Solar Energy Research, OpTIC Glyndŵr, St. Asaph, UK B.L. Williams, V. Zardetto, W.M.M.
Date of download: 6/22/2016 Copyright © ASME. All rights reserved. From: Efficiency Enhancement of GaAs Solar Cell Using Luminescent Down-Shifting Layer.
Hot Disk Transient Plane Source (TPS) Technique
(a)luminescence (LED) (b)optical amplifiers (c)laser diodes.
Date of download: 7/9/2016 Copyright © 2016 SPIE. All rights reserved. Band profile and local density of states of a 40-nm GaAs pin junction solar cell.
Work package 3: Materials for energy
Possible methods of circumventing the 31% efficiency limit for thermalized carriers in a single–band gap absorption threshold solar quantum.
Planetary Ionospheres
Deep Level Transient Spectroscopy (DLTS)
Exciton Fission in Solid Tetracene and Related Materials: a Possible Strategy for High Efficiency Organic Solar Cells Increasing the yield of charge carriers.
Lecture 3 OUTLINE Semiconductor Basics (cont’d) PN Junction Diodes
Understanding Motion Graphs
Multi-Exciton Generation and Solar Cell Physics
Exciton Dissociation at Metal-Organic Interface and
Presentation transcript:

EXSS Quantum Photovoltaics Hot Carriers in Strain Balanced Quantum Well Solar Cells M. F. Führer, J.P. Connolly, M. Mazzer, I. M. Ballard, D.C. Johnson, K. W. J. Barnham, A.Bessière, J. S. Roberts, R. Airey, C. Calder, G. Hill Contact:

EXSS Quantum Photovoltaics Quantum Well Solar Cells Extended Absorption Strain Balancing Increased Efficiency

EXSS Quantum Photovoltaics Our Samples various depth InGaAs Wells GaAsP Barriers Concentrator Masks: Homogeneous at high bias

EXSS Quantum Photovoltaics Electroluminescence Setup

EXSS Quantum Photovoltaics Results – Single Medium Well

EXSS Quantum Photovoltaics Results – Ten Medium Well

EXSS Quantum Photovoltaics Results – 50 Deep Wells

EXSS Quantum Photovoltaics Bias Dependence

EXSS Quantum Photovoltaics Results - Depth dependence?

EXSS Quantum Photovoltaics Interpretations Sample Heating Non-Equilibrium Effects (Hot Carriers) High Exciton Density Effects

EXSS Quantum Photovoltaics Interpretations – Sample Heating Yes, some samples are heating up… identify with: –  E G – Bulk slope …and discard. However, effect persists even in samples without changing bulk T. Not just sample heating.

EXSS Quantum Photovoltaics Interpretations Model for Recombination: Generalised Planck Non-equilibrium interpretations focus on T and  E F Other interpretations focus on  (E) Measuring these quantities is difficult

EXSS Quantum Photovoltaics Interpretations – Hot Carriers

EXSS Quantum Photovoltaics Interpretations – Hot Carriers assume constant absorption Vary T and  E F for non- equilibrium effects

EXSS Quantum Photovoltaics Interpretations – Hot Carriers Raises possibilities of hot carrier solar cells – (which bypass Shockley-Queisser limit) Most attractive Interpretation Fits data reasonably well

EXSS Quantum Photovoltaics Interpretations – Exciton Effects Most of the recombination stems from recombining excitons Excitons are bosons only at long distance Interactions amplified by confinement in the quantum well

EXSS Quantum Photovoltaics Interpretations – Exciton Effects

EXSS Quantum Photovoltaics Interpretations – Exciton Effects

EXSS Quantum Photovoltaics Interpretations – Exciton Effects Kink in the I SC vs Power curve suggests decreased absorption beyond a certain optical bias Some evidence against heating Needs further study

EXSS Quantum Photovoltaics Conclusions Significant evidence of a high-bias effect in GaAs based quantum well solar cells – relative reduction in peak exciton emission Several interpretations – Hot Carriers – Exciton Interactions More work needed.