Thin-film multiple-quantum-well solar cells fabricated by epitaxial lift-off process

Thin-film solar cells fabricated using the epitaxial lift-off (ELO) process enable considerable cost reduction as well as light-trapping. A polyimide film was used as a support substrate for thin film devices to address the poor temperature tolerance of poly(ethylene terephthalate) films. Samples were stuck to polyimide films by an Au–Au bonding process. It was found that the insertion of a wetting layer enhanced the adhesion between a polyimide film and an Au layer. The achieved bonding was strong enough to carry out the ELO process, and no degradation was observed in cell performance. Thin-film solar cells with strain-balanced multiple quantum wells were also fabricated using the ELO process to benefit from the light-trapping effect. Quantum efficiency enhancement was observed in the long-wavelength range of 850–980 nm compared to the non-ELO-processed devices. The photo-absorption enhancement was due to the Fabry–Perot resonance between the surface and the rear Au electrodes.

[1]  Jingli Luo,et al.  Formation of As2O3 during anodic dissolution of GaAs , 2000 .

[2]  Stephen R. Forrest,et al.  Ultrathin film, high specific power InP solar cells on flexible plastic substrates , 2009 .

[3]  Y. Song,et al.  Fabrication and analysis of thin-film GaAs solar cell on flexible thermoplastic substrate using a low-pressure cold-welding , 2015 .

[4]  Eli Yablonovitch,et al.  Strong Internal and External Luminescence as Solar Cells Approach the Shockley–Queisser Limit , 2012, IEEE Journal of Photovoltaics.

[5]  Stephen R. Forrest,et al.  Non‐Destructive Wafer Recycling for Low‐Cost Thin‐Film Flexible Optoelectronics , 2014 .

[6]  M. Sugimoto,et al.  High efficiency GaAs thin film solar cells by peeled film technology , 1978 .

[7]  Michael Woodhouse,et al.  Techno‐economic analysis of three different substrate removal and reuse strategies for III‐V solar cells , 2016 .

[8]  N. Pan,et al.  Epitaxial lift-off of quantum dot enhanced GaAs single junction solar cells , 2013 .

[9]  C. Stender,et al.  Demonstration of multiple substrate reuses for inverted metamorphic solar cells , 2013, 2012 IEEE 38th Photovoltaic Specialists Conference (PVSC) PART 2.

[10]  J. Schermer,et al.  Epitaxial Lift‐Off for large area thin film III/V devices , 2005 .

[11]  D. DeVoe,et al.  Sacrificial etching of AlxGa1-xAs for III–V MEMS surface micromachining , 2007 .

[12]  R. Horng,et al.  Improvement in separation rate of epitaxial lift-off by hydrophilic solvent for GaAs solar cell applications , 2014 .

[13]  G. J. Bauhuis,et al.  Influence of radius of curvature on the lateral etch rate of the weight induced epitaxial lift-off process , 2002 .

[14]  Myles A. Steiner,et al.  Optical enhancement of the open-circuit voltage in high quality GaAs solar cells , 2013 .

[15]  G. J. Bauhuis,et al.  Epitaxial lift-off GaAs solar cell from a reusable GaAs substrate , 1997 .

[16]  J. Schermer,et al.  A Diffusion and Reaction Related Model of the Epitaxial Lift-Off Process , 2007 .

[17]  Stephen R. Forrest,et al.  Multiple growths of epitaxial lift-off solar cells from a single InP substrate , 2010 .

[18]  J. van Deelen,et al.  Photon confinement in high-efficiency, thin-film III–V solar cells obtained by epitaxial lift-off , 2006 .

[19]  E. J. Haverkamp,et al.  Wafer reuse for repeated growth of III–V solar cells , 2010 .

[20]  Jaejin Lee,et al.  Highly efficient single-junction GaAs thin-film solar cell on flexible substrate , 2016, Scientific Reports.

[21]  N. J. Smeenk,et al.  Arsenic Formation on GaAs during Etching in HF Solutions: Relevance for the Epitaxial Lift-Off Process , 2013 .

[22]  P. K. Larsen,et al.  Multiple release layer study of the intrinsic lateral etch rate of the epitaxial lift-off process , 2004 .

[23]  Leathen Shi,et al.  Epitaxial lift-off process for gallium arsenide substrate reuse and flexible electronics , 2013, Nature Communications.

[24]  E. J. Haverkamp,et al.  High rate epitaxial lift-off of InGaP films from GaAs substrates , 2000 .

[25]  Xiaolin Zheng,et al.  Transfer printing methods for flexible thin film solar cells: basic concepts and working principles. , 2014, ACS nano.

[26]  J. Rogers,et al.  GaAs photovoltaics and optoelectronics using releasable multilayer epitaxial assemblies , 2010, Nature.

[27]  J. Schermer,et al.  Etching AlAs with HF for Epitaxial Lift-Off Applications , 2004 .

[28]  H. Lüth,et al.  Te doping of GaAs using diethyl‐tellurium , 1994 .

[29]  J. Schermer,et al.  Enhancement of current collection in epitaxial lift-off InAs/GaAs quantum dot thin film solar cell and concentrated photovoltaic study , 2014 .

[30]  Dominique Drouin,et al.  Chemical Composition of Nanoporous Layer Formed by Electrochemical Etching of p-Type GaAs , 2016, Nanoscale Research Letters.

[31]  E. Yablonovitch,et al.  Extreme selectivity in the lift‐off of epitaxial GaAs films , 1987 .

[32]  Shin Yokoyama,et al.  High-Rate GaAs Epitaxial Lift-Off Technique for Optoelectronic Integrated Circuits , 1997 .

[33]  S. Forrest,et al.  Reuse of GaAs substrates for epitaxial lift-off by employing protection layers , 2012 .