Progress and Design Concerns of Nanostructured Solar Energy Harvesting Devices.

Integrating devices with nanostructures is considered a promising strategy to improve the performance of solar energy harvesting devices such as photovoltaic (PV) devices and photo-electrochemical (PEC) solar water splitting devices. Extensive efforts have been exerted to improve the power conversion efficiencies (PCE) of such devices by utilizing novel nanostructures to revolutionize device structural designs. The thicknesses of light absorber and material consumption can be substantially reduced because of light trapping with nanostructures. Meanwhile, the utilization of nanostructures can also result in more effective carrier collection by shortening the photogenerated carrier collection path length. Nevertheless, performance optimization of nanostructured solar energy harvesting devices requires a rational design of various aspects of the nanostructures, such as their shape, aspect ratio, periodicity, etc. Without this, the utilization of nanostructures can lead to compromised device performance as the incorporation of these structures can result in defects and additional carrier recombination. The design guidelines of solar energy harvesting devices are summarized, including thin film non-uniformity on nanostructures, surface recombination, parasitic absorption, and the importance of uniform distribution of photo-generated carriers. A systematic view of the design concerns will assist better understanding of device physics and benefit the fabrication of high performance devices in the future.

[1]  Emilio Palomares,et al.  Charge transport versus recombination in dye-sensitized solar cells employing nanocrystalline TiO2 and SnO2 films. , 2005, The journal of physical chemistry. B.

[2]  Jinyao Tang,et al.  Solution-processed core-shell nanowires for efficient photovoltaic cells. , 2011, Nature nanotechnology.

[3]  Ning Han,et al.  Developing controllable anisotropic wet etching to achieve silicon nanorods, nanopencils and nanocones for efficient photon trapping , 2013 .

[4]  Gang Chen,et al.  Efficient light trapping in inverted nanopyramid thin crystalline silicon membranes for solar cell applications. , 2012, Nano letters.

[5]  Zongfu Yu,et al.  Hybrid silicon nanocone-polymer solar cells. , 2012, Nano letters.

[6]  Lifeng Li,et al.  New formulation of the Fourier modal method for crossed surface-relief gratings , 1997 .

[7]  Y. Rosenwaks,et al.  Effects of reactive versus unreactive metals on the surface recombination velocity at CdS and CdSe(112̄0) interfaces , 1990 .

[8]  Giacomo Mariani,et al.  Direct-bandgap epitaxial core-multishell nanopillar photovoltaics featuring subwavelength optical concentrators. , 2013, Nano letters.

[9]  A. Javey,et al.  Molecular monolayers for conformal, nanoscale doping of InP nanopillar photovoltaics , 2011 .

[10]  G. Barbastathis,et al.  Multifunctional inverted nanocone arrays for non-wetting, self-cleaning transparent surface with high mechanical robustness. , 2014, Small.

[11]  Jr-Hau He,et al.  Periodic si nanopillar arrays fabricated by colloidal lithography and catalytic etching for broadband and omnidirectional elimination of Fresnel reflection. , 2010, Langmuir : the ACS journal of surfaces and colloids.

[12]  A. Sabbah,et al.  Measurement of silicon surface recombination velocity using ultrafast pump–probe reflectivity in the near infrared , 2000 .

[13]  Tae Joon Seok,et al.  Roll-to-roll anodization and etching of aluminum foils for high-throughput surface nanotexturing. , 2011, Nano letters.

[14]  Ratan Debnath,et al.  Ordered Nanopillar Structured Electrodes for Depleted Bulk Heterojunction Colloidal Quantum Dot Solar Cells , 2012, Advanced materials.

[15]  Zhiyong Fan,et al.  Low‐Cost, Flexible, and Self‐Cleaning 3D Nanocone Anti‐Reflection Films for High‐Efficiency Photovoltaics , 2014, Advanced materials.

[16]  A. Javey,et al.  Design constraints and guidelines for CdS/CdTe nanopillar based photovoltaics , 2010 .

[17]  Xin Wang,et al.  High-performance silicon nanohole solar cells. , 2010, Journal of the American Chemical Society.

[18]  Shanhui Fan,et al.  S4 : A free electromagnetic solver for layered periodic structures , 2012, Comput. Phys. Commun..

[19]  Kai Zhu,et al.  Enhanced charge-collection efficiencies and light scattering in dye-sensitized solar cells using oriented TiO2 nanotubes arrays. , 2007, Nano letters.

[20]  Yi Cui,et al.  Light trapping in solar cells: can periodic beat random? , 2012, ACS nano.

[21]  Zongfu Yu,et al.  Nanodome solar cells with efficient light management and self-cleaning. , 2010, Nano letters.

[22]  Yi Cui,et al.  Absorption enhancement in ultrathin crystalline silicon solar cells with antireflection and light-trapping nanocone gratings. , 2012, Nano letters.

[23]  Peidong Yang,et al.  Nanowire dye-sensitized solar cells , 2005, Nature materials.

[24]  Zhong Lin Wang,et al.  Vertically aligned CdSe nanowire arrays for energy harvesting and piezotronic devices. , 2012, ACS nano.

[25]  Zhiyong Fan,et al.  Three-dimensional nanopillar-array photovoltaics on low-cost and flexible substrates. , 2009, Nature materials.

[26]  Yi Cui,et al.  Realization of 13.6% Efficiency on 20 μm Thick Si/Organic Hybrid Heterojunction Solar Cells via Advanced Nanotexturing and Surface Recombination Suppression. , 2015, ACS nano.

[27]  Zongfu Yu,et al.  Optical absorption enhancement in amorphous silicon nanowire and nanocone arrays. , 2009, Nano letters.

[28]  Lifeng Chi,et al.  Biomimetic corrugated silicon nanocone arrays for self-cleaning antireflection coatings , 2010 .

[29]  Z. Fan,et al.  Programmable nanoengineering templates for fabrication of three-dimensional nanophotonic structures , 2013, Nanoscale Research Letters.

[30]  Jun Xu,et al.  Fabrication of highly ordered CuInSe2 films with hollow nanocones for anti-reflection , 2011 .

[31]  Peidong Yang,et al.  Silicon nanowire radial p-n junction solar cells. , 2008, Journal of the American Chemical Society.

[32]  Nathan S. Lewis,et al.  Comparison of the device physics principles of planar and radial p-n junction nanorod solar cells , 2005 .

[33]  Zhiyong Fan,et al.  Flexible photovoltaic technologies , 2014 .

[34]  Yuegang Zhang,et al.  Efficient photoelectrochemical water splitting with ultrathin films of hematite on three-dimensional nanophotonic structures. , 2014, Nano letters.

[35]  Shui-Tong Lee,et al.  Core-shell structured photovoltaic devices based on PbS quantum dots and silicon nanopillar arrays. , 2012, Nanoscale.

[36]  Seung Hwan Ko,et al.  Nanoforest of hydrothermally grown hierarchical ZnO nanowires for a high efficiency dye-sensitized solar cell. , 2011, Nano letters.

[37]  F. Ross,et al.  Three-dimensional a-Si:H solar cells on glass nanocone arrays patterned by self-assembled Sn nanospheres. , 2012, ACS nano.

[38]  Edward H. Sargent,et al.  Broadband solar absorption enhancement via periodic nanostructuring of electrodes , 2013, Scientific Reports.

[39]  Zhiyong Fan,et al.  Efficient photon management with nanostructures for photovoltaics. , 2013, Nanoscale.

[40]  D. Thompson,et al.  GaAs core--shell nanowires for photovoltaic applications. , 2009, Nano letters.

[41]  T. Ishihara,et al.  Quasiguided modes and optical properties of photonic crystal slabs , 2002 .

[42]  Harry A Atwater,et al.  Design of nanostructured solar cells using coupled optical and electrical modeling. , 2012, Nano letters.

[43]  Ning-Bew Wong,et al.  Highly active and enhanced photocatalytic silicon nanowire arrays. , 2011, Nanoscale.

[44]  Zhiyong Fan,et al.  Rational geometrical design of multi-diameter nanopillars for efficient light harvesting , 2013 .

[45]  Yangsen Kang,et al.  High-efficiency nanostructured window GaAs solar cells. , 2013, Nano letters.

[46]  Jr-hau He,et al.  Surface profile-controlled close-packed Si nanorod arrays for self-cleaning antireflection coatings. , 2009, Journal of applied physics.

[47]  Jr-hau He,et al.  Periodic Si nanopillar arrays by anodic aluminum oxide template and catalytic etching for broadband and omnidirectional light harvesting. , 2012, Optics express.

[48]  Martin A. Green,et al.  Lambertian light trapping in textured solar cells and light‐emitting diodes: analytical solutions , 2002 .

[49]  Z. Fan,et al.  A three-dimensional hexagonal fluorine-doped tin oxide nanocone array: a superior light harvesting electrode for high performance photoelectrochemical water splitting , 2014 .

[50]  Christophe Ballif,et al.  Influence of the substrate geometrical parameters on microcrystalline silicon growth for thin-film solar cells , 2009 .

[51]  Zhiyong Fan,et al.  Efficient photon capturing with ordered three-dimensional nanowell arrays. , 2012, Nano letters.

[52]  Wenjuan Shan,et al.  Template-guided growth of well-aligned ZnO nanocone arrays on FTO substrate , 2012 .

[53]  Zhiyong Fan,et al.  Performance enhancement of thin-film amorphous silicon solar cells with low cost nanodent plasmonic substrates , 2013 .

[54]  Christophe Ballif,et al.  Model for a-Si: H/c-Si interface recombination based on the amphoteric nature of silicon dangling bonds , 2007 .

[55]  Nathan S Lewis,et al.  Photovoltaic measurements in single-nanowire silicon solar cells. , 2008, Nano letters.

[56]  Zongfu Yu,et al.  Optical Absorption Enhancement in Freestanding GaAs Thin Film Nanopyramid Arrays , 2012 .

[57]  Hung-Chih Chang,et al.  Significant efficiency enhancement of hybrid solar cells using core-shell nanowire geometry for energy harvesting. , 2011, ACS nano.

[58]  Shixin Wu,et al.  Electrochemical deposition of ZnO nanorods on transparent reduced graphene oxide electrodes for hybrid solar cells. , 2010, Small.

[59]  Z. Fan,et al.  Nanomaterials and nanostructures for efficient light absorption and photovoltaics , 2012 .

[60]  G. Cody,et al.  Intensity enhancement in textured optical sheets for solar cells , 1982, IEEE Transactions on Electron Devices.

[61]  Zhiyong Fan,et al.  Strong light absorption of self-organized 3-D nanospike arrays for photovoltaic applications. , 2011, ACS nano.

[62]  Zhiyong Fan,et al.  Ordered arrays of dual-diameter nanopillars for maximized optical absorption. , 2010, Nano letters.

[63]  Zhiyong Fan,et al.  Coupled optical and electrical modeling of thin-film amorphous silicon solar cells based on nanodent plasmonic substrates , 2014 .

[64]  J. Ho,et al.  Light Management with Nanostructures for Optoelectronic Devices. , 2014, The journal of physical chemistry letters.

[65]  Hao-Chih Yuan,et al.  An 18.2%-efficient black-silicon solar cell achieved through control of carrier recombination in nanostructures. , 2012, Nature nanotechnology.

[66]  Zhiyong Fan,et al.  Inverted nanocone-based thin film photovoltaics with omnidirectionally enhanced performance. , 2014, ACS nano.

[67]  Jr-Hau He,et al.  Slope-tunable Si nanorod arrays with enhanced antireflection and self-cleaning properties. , 2010, Nanoscale.

[68]  Paul W. Leu,et al.  Enhanced absorption in silicon nanocone arrays for photovoltaics , 2012, Nanotechnology.

[69]  Michael Grätzel,et al.  New Benchmark for Water Photooxidation by Nanostructured α-Fe2O3 Films , 2006 .

[70]  Keith R. McIntosh,et al.  Recombination at textured silicon surfaces passivated with silicon dioxide , 2009 .

[71]  Yan Yao,et al.  Highly Efficient Flexible Perovskite Solar Cells with Antireflection and Self-Cleaning Nanostructures. , 2015, ACS nano.

[72]  Zhiyong Fan,et al.  Roll-to-roll fabrication of large scale and regular arrays of three-dimensional nanospikes for high efficiency and flexible photovoltaics , 2014, Scientific Reports.

[73]  F. Dimroth,et al.  InP Nanowire Array Solar Cells Achieving 13.8% Efficiency by Exceeding the Ray Optics Limit , 2013, Science.

[74]  C. Battaglia,et al.  9.4% Efficient Amorphous Silicon Solar Cell on High Aspect‐Ratio Glass Microcones , 2014, Advanced materials.

[75]  Yi Cui,et al.  High‐Efficiency Amorphous Silicon Solar Cell on a Periodic Nanocone Back Reflector , 2012 .

[76]  H. A. Atwater,et al.  Accounting for Localized Defects in the Optoelectronic Design of Thin-Film Solar Cells , 2013, IEEE Journal of Photovoltaics.

[77]  Yi Cui,et al.  All-back-contact ultra-thin silicon nanocone solar cells with 13.7% power conversion efficiency , 2013, Nature Communications.

[78]  Yi Cui,et al.  Wafer-scale silicon nanopillars and nanocones by Langmuir-Blodgett assembly and etching , 2008 .

[79]  Zhiyong Fan,et al.  Efficient light absorption with integrated nanopillar/nanowell arrays for three-dimensional thin-film photovoltaic applications. , 2013, ACS nano.

[80]  Emilio Palomares,et al.  Control of charge recombination dynamics in dye sensitized solar cells by the use of conformally deposited metal oxide blocking layers. , 2003, Journal of the American Chemical Society.

[81]  Bozhi Tian,et al.  Single and tandem axial p-i-n nanowire photovoltaic devices. , 2008, Nano letters.

[82]  Bryan M. Wong,et al.  Optical, structural, and numerical investigations of GaAs/AlGaAs core-multishell nanowire quantum well tubes. , 2013, Nano letters.

[83]  Gang Chen,et al.  Optical absorption enhancement in silicon nanohole arrays for solar photovoltaics. , 2010, Nano letters.

[84]  Zhiyong Fan,et al.  Nanopillar photovoltaics: Materials, processes, and devices , 2012 .

[85]  V. Klimov.  Mechanisms for photogeneration and recombination of multiexcitons in semiconductor nanocrystals: implications for lasing and solar energy conversion. , 2006, The journal of physical chemistry. B.

[86]  Jihun Oh,et al.  Nanoporous black silicon photocathode for H2 production by photoelectrochemical water splitting , 2011 .