CH3NH3PbI3 planar perovskite solar cells with antireflection and self-cleaning function layers

We report CH3NH3PbI3 planar perovskite solar cells with multifunctional inverted micro-pyramidal structured (IMPS) polydimethylsiloxane (PDMS) antireflection (AR) layers for enhancing the device efficiency. These IMPS-PDMS films were fabricated via a facile and cost-effective soft lithography using micro-pyramidal structured silicon (Si) master molds formed by alkaline anisotropic wet-etching treatment of (100)-oriented monocrystalline Si substrates. The IMPS-PDMS laminated on the bare glass (i.e., IMPS-PDMS/glass) exhibited a higher solar weighted transmittance (TSW) value of ∼95.2% (or the lowest solar weighted reflectance (RSW) of ∼4.7%) than those of the bare glass and flat-PDMS/glass, i.e., TSW/RSW ∼ 90.7/9.1 and 91.5/8.2%, respectively. Additionally, it showed a much higher average haze ratio (HA) value of ∼93.1% compared to the bare glass and flat-PDMS/glass (i.e., HA ∼ 1.6 and 2.8%, respectively). By employing the IMPS-PDMS onto the outer surface of CH3NH3PbI3 planar perovskite solar cells as an AR layer, an improved short-circuit current density (Jsc) value of 21.25 mA cm−2 was obtained, as compared to the reference device and the device with flat-PDMS (i.e., Jsc = 20.57 and 20.87 mA cm−2, respectively), while showing the almost same Voc and FF values as those of the reference device. As a result, the power conversion efficiency was improved from 17.17 and 17.42% for the reference and flat-PDMS devices, respectively, to 17.74% for the IMPS-PDMS device. Also, the fluorooctyltrichlorosilane-treated IMPS-PDMS surface revealed a superhydrophobic behavior with a water contact angle of ∼150° which is useful for self-cleaning applications in outdoor environments.

[1]  D. Stavenga,et al.  Light on the moth-eye corneal nipple array of butterflies , 2006, Proceedings of the Royal Society B: Biological Sciences.

[2]  John A. Rogers,et al.  Efficiency Enhancement of Organic Solar Cells Using Hydrophobic Antireflective Inverted Moth‐Eye Nanopatterned PDMS Films , 2014 .

[3]  Young Min Song,et al.  Enhanced power generation in concentrated photovoltaics using broadband antireflective coverglasses with moth eye structures. , 2012, Optics express.

[4]  Yang Yang,et al.  Interface engineering of highly efficient perovskite solar cells , 2014, Science.

[5]  Jongbaeg Kim,et al.  Molecularly Engineered Surface Triboelectric Nanogenerator by Self-Assembled Monolayers (METS) , 2015 .

[6]  M. Green,et al.  A novel silver nanoparticle assisted texture as broadband antireflection coating for solar cell applications , 2013 .

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

[8]  Young Chan Kim,et al.  Compositional engineering of perovskite materials for high-performance solar cells , 2015, Nature.

[9]  Joo Yeon Kim,et al.  The periodically negative semi-pyramid nanostructured polymer layer for broadband anti-reflection effect , 2012 .

[10]  A. Cassie,et al.  Wettability of porous surfaces , 1944 .

[11]  Minkyu Choi,et al.  Broadband and omnidirectional highly-transparent coverglasses coated with biomimetic moth-eye nanopatterned polymer films for solar photovoltaic system applications , 2015 .

[12]  J. Yu,et al.  Highly transparent sapphire micro-grating structures with large diffuse light scattering. , 2011, Optics express.

[13]  Jae Su Yu,et al.  Highly efficient low temperature solution processable planar type CH3NH3PbI3 perovskite flexible solar cells , 2016 .

[14]  M. Green,et al.  Light trapping properties of pyramidally textured surfaces , 1987 .

[15]  Tae-Woo Lee,et al.  Planar CH3NH3PbI3 Perovskite Solar Cells with Constant 17.2% Average Power Conversion Efficiency Irrespective of the Scan Rate , 2015, Advanced materials.

[16]  Se-Jin Choi,et al.  Direct structuring of a biomimetic anti-reflective, self-cleaning surface for light harvesting in organic solar cells. , 2010, Macromolecular rapid communications.

[17]  Shi-Joon Sung,et al.  Hysteresis-less mesoscopic CH3NH3PbI3 perovskite hybrid solar cells by introduction of Li-treated TiO2 electrode , 2015 .

[18]  Peng Jiang,et al.  Biomimetic broadband antireflection gratings on solar-grade multicrystalline silicon wafers , 2011 .

[19]  Insung S. Choi,et al.  Fabrication of Hairy Polymeric Films Inspired by Geckos: Wetting and High Adhesion Properties , 2008 .

[20]  Martin A. Green,et al.  Optimized antireflection coatings for high-efficiency silicon solar cells , 1991 .

[21]  Sang‐Woo Kim,et al.  Zinc-embedded silica nanoparticle layer in a multilayer coating on a glass substrate achieves broadband antireflection and high transparency , 2004 .

[22]  J. Yu,et al.  Biomimetic artificial Si compound eye surface structures with broadband and wide-angle antireflection properties for Si-based optoelectronic applications. , 2013, Nanoscale.

[23]  Maesoon Im,et al.  Self-cleaning effect of highly water-repellent microshell structures for solar cell applications , 2011 .

[24]  Timothy L. Kelly,et al.  Perovskite solar cells with a planar heterojunction structure prepared using room-temperature solution processing techniques , 2013, Nature Photonics.

[25]  E. Fred Schubert,et al.  Optical thin-film materials with low refractive index for broadband elimination of Fresnel reflection , 2007 .

[26]  J. Heo,et al.  Highly reproducible, efficient hysteresis-less CH3NH3PbI(3-x)Cl(x) planar hybrid solar cells without requiring heat-treatment. , 2016, Nanoscale.

[27]  Tae Kyu Ahn,et al.  Hysteresis-less inverted CH3NH3PbI3 planar perovskite hybrid solar cells with 18.1% power conversion efficiency , 2015 .

[28]  J. Yu,et al.  Bioinspired parabola subwavelength structures for improved broadband antireflection. , 2010, Small.

[29]  Zhongfan Liu,et al.  The fabrication of subwavelength anti-reflective nanostructures using a bio-template , 2008, Nanotechnology.

[30]  Viktor Malyarchuk,et al.  Digital cameras with designs inspired by the arthropod eye , 2013, Nature.

[31]  Minkyu Choi,et al.  Antireflective gradient-refractive-index material-distributed microstructures with high haze and superhydrophilicity for silicon-based optoelectronic applications , 2015 .

[32]  Jr-hau He,et al.  Above-11%-efficiency organic-inorganic hybrid solar cells with omnidirectional harvesting characteristics by employing hierarchical photon-trapping structures. , 2013, Nano letters.

[33]  J. Noh,et al.  Efficient inorganic–organic hybrid heterojunction solar cells containing perovskite compound and polymeric hole conductors , 2013, Nature Photonics.

[34]  J. Yu,et al.  Biomimetic parabola-shaped AZO subwavelength grating structures for efficient antireflection of Si-based solar cells , 2011 .

[35]  Byoungho Lee,et al.  Efficient light harvesting with micropatterned 3D pyramidal photoanodes in dye-sensitized solar cells. , 2013, Advanced materials.

[36]  J. Heo,et al.  CH3NH3PbI3/poly‐3‐hexylthiophen perovskite mesoscopic solar cells: Performance enhancement by Li‐assisted hole conduction , 2014 .

[37]  Dae Ho Song,et al.  Planar CH3NH3PbBr3 Hybrid Solar Cells with 10.4% Power Conversion Efficiency, Fabricated by Controlled Crystallization in the Spin‐Coating Process , 2014, Advanced materials.

[38]  Bhaskar Dudem,et al.  Multifunctional polymers with biomimetic compound architectures via nanoporous AAO films for efficient solar energy harvesting in dye-sensitized solar cells , 2015 .

[39]  M. Grätzel,et al.  Sequential deposition as a route to high-performance perovskite-sensitized solar cells , 2013, Nature.

[40]  Francesco Galeotti,et al.  Broadband and crack-free antireflection coatings by self-assembled moth eye patterns. , 2014, ACS applied materials & interfaces.

[41]  Angeliki Tserepi,et al.  Nanotexturing of poly(dimethylsiloxane) in plasmas for creating robust super-hydrophobic surfaces , 2006 .

[42]  Henry J. Snaith,et al.  Efficient planar heterojunction perovskite solar cells by vapour deposition , 2013, Nature.

[43]  W. Sinke,et al.  Alkaline Etching for Reflectance Reduction in Multicrystalline Silicon Solar Cells , 2004 .

[44]  Jae Su Yu,et al.  Artificial inverted compound eye structured polymer films with light-harvesting and self-cleaning functions for encapsulated III–V solar cell applications , 2015 .

[45]  M. Konagai,et al.  Management of light-trapping effect for a-Si:H/µc-Si:H tandem solar cells using novel substrates, based on MOCVD ZnO and etched white glass , 2013 .

[46]  Nam-Gyu Park,et al.  Growth of CH3NH3PbI3 cuboids with controlled size for high-efficiency perovskite solar cells. , 2014, Nature nanotechnology.

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

[48]  C. S. Bhatia,et al.  Omnidirectional study of nanostructured glass packaging for solar modules , 2014 .

[49]  J. Teuscher,et al.  Efficient Hybrid Solar Cells Based on Meso-Superstructured Organometal Halide Perovskites , 2012, Science.

[50]  Seeram Ramakrishna,et al.  Anti-reflective coatings: A critical, in-depth review , 2011 .

[51]  Sang Il Seok,et al.  Solvent engineering for high-performance inorganic-organic hybrid perovskite solar cells. , 2014, Nature materials.

[52]  Effect of etching parameters on antireflection properties of Si subwavelength grating structures for solar cell applications , 2010 .

[53]  Sang Il Seok,et al.  High-performance photovoltaic perovskite layers fabricated through intramolecular exchange , 2015, Science.

[54]  Improvement in light harvesting of dye-sensitized solar cells with antireflective and hydrophobic textile PDMS coating by facile soft imprint lithography. , 2015, Optics express.

[55]  Henk J. Bolink,et al.  Perovskite solar cells employing organic charge-transport layers , 2013, Nature Photonics.

[56]  N. Park,et al.  Lead Iodide Perovskite Sensitized All-Solid-State Submicron Thin Film Mesoscopic Solar Cell with Efficiency Exceeding 9% , 2012, Scientific Reports.

[57]  Lon A. Wang,et al.  Fabrication and characterization of multi-scale microlens arrays with anti-reflection and diffusion properties , 2011, Nanotechnology.

[58]  Young Min Song,et al.  Six-fold hexagonal symmetric nanostructures with various periodic shapes on GaAs substrates for efficient antireflection and hydrophobic properties. , 2011, Nanotechnology.

[59]  Zhongfan Liu,et al.  Cicada wings: a stamp from nature for nanoimprint lithography. , 2006, Small.

[60]  Hisao Kikuta,et al.  Fabrication of Microcone Array for Antireflection Structured Surface Using Metal Dotted Pattern , 2001 .

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

[62]  K. Carter,et al.  High-resolution soft lithography of thin film resists enabling nanoscopic pattern transfer. , 2007, Soft matter.

[63]  Jinsong Huang,et al.  Solvent Annealing of Perovskite‐Induced Crystal Growth for Photovoltaic‐Device Efficiency Enhancement , 2014, Advanced materials.

[64]  H. Heise,et al.  Optical absorption in transparent PDMS materials applied for multimode waveguides fabrication , 2008 .

[65]  Tsutomu Miyasaka,et al.  Organometal halide perovskites as visible-light sensitizers for photovoltaic cells. , 2009, Journal of the American Chemical Society.