Inverted nanocone-based thin film photovoltaics with omnidirectionally enhanced performance.

Thin film photovoltaic (PV) technologies are highly attractive for low-cost solar energy conversion and possess a wide range of potential applications from building-integrated PV generation to portable power sources. Inverted nanocones (i-cones) have been demonstrated as a promising structure for practical thin film PV devices/modules, owning to their antireflection effect, self-cleaning function, superior mechanical robustness, and so forth. In this work, we have demonstrated a low-cost and scalable approach to achieve perfectly ordered i-cone arrays. Thereafter, thin film amorphous silicon (a-Si:H) solar cells have been fabricated based on various i-cone substrates with different aspect ratios and pitches to investigate the impact of geometry of i-cone nanostructures on the performance of the as-obtained PV devices. Intriguingly, the optical property investigations and device performance characterizations demonstrated that the 0.5-aspect-ratio i-cone-based device performed the best on both light absorption capability and energy conversion efficiency, which is 34% higher than that of the flat counterpart. Moreover, the i-cone-based device enhanced the light absorption and device performance over the flat reference device omnidirectionally. These results demonstrate a viable and convenient route toward scalable fabrication of nanostructures for high-performance thin film PV devices based on a broad range of materials.

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

[2]  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.

[3]  Gang Chen,et al.  Toward the Lambertian limit of light trapping in thin nanostructured silicon solar cells. , 2010, Nano letters.

[4]  Jonathan Grandidier,et al.  Light Absorption Enhancement in Thin‐Film Solar Cells Using Whispering Gallery Modes in Dielectric Nanospheres , 2011, Advanced materials.

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

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

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

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

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

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

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

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

[13]  Jürgen H. Werner,et al.  Flexible solar cells for clothing , 2006 .

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

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

[16]  Hsuen‐Li Chen,et al.  Using colloidal lithography to fabricate and optimize sub-wavelength pyramidal and honeycomb structures in solar cells. , 2007, Optics express.

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

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

[19]  Ning Han,et al.  Rational design of inverted nanopencil arrays for cost-effective, broadband, and omnidirectional light harvesting. , 2014, ACS nano.

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

[21]  John A Rogers,et al.  In(x)Ga(₁-x)As nanowires on silicon: one-dimensional heterogeneous epitaxy, bandgap engineering, and photovoltaics. , 2011, Nano letters.

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

[23]  D. Tsai,et al.  Ultra-high-responsivity broadband detection of Si metal-semiconductor-metal Schottky photodetectors improved by ZnO nanorod arrays. , 2011, ACS nano.

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

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

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

[27]  Nathan S Lewis,et al.  Enhanced absorption and carrier collection in Si wire arrays for photovoltaic applications. , 2010, Nature materials.

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

[29]  Jr-Hau He,et al.  Nanowire arrays with controlled structure profiles for maximizing optical collection efficiency , 2011 .

[30]  Zhiyong Fan,et al.  Photovoltaics: solar cells on curtains. , 2008, Nature materials.

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

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

[33]  Yi Cui,et al.  Broadband light management using low-Q whispering gallery modes in spherical nanoshells , 2012, Nature Communications.

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

[35]  H. Kuo,et al.  Non-antireflective scheme for efficiency enhancement of Cu(In,Ga)Se2 nanotip array solar cells. , 2013, ACS nano.

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

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