An effective and low-cost front-side anti-reflection(AR) technique has long been sought to enhance the performance of highly efficient photovoltaic devices due to its capability of maximizing the light absorption in p...An effective and low-cost front-side anti-reflection(AR) technique has long been sought to enhance the performance of highly efficient photovoltaic devices due to its capability of maximizing the light absorption in photovoltaic devices. In order to achieve high throughput fabrication of nanostructured flexible and anti-reflection films, large-scale, nano-engineered wafer molds were fabricated in this work. Additionally, to gain in-depth understanding of the optical and electrical performance enhancement with AR films on polycrystalline Si solar cells, both theoretical and experimental studies were performed. Intriguingly,the nanocone structures demonstrated an efficient light trapping effect which reduced the surface reflection of a solar cell by17.7% and therefore enhanced the overall electric output power of photovoltaic devices by 6% at normal light incidence. Notably, the output power improvement is even more significant at a larger light incident angle which is practically meaningful for daily operation of solar panels. The application of the developed AR films is not only limited to crystalline Si solar cells explored here, but also compatible with any types of photovoltaic technology for performance enhancement.展开更多
Inspired by cicada wings,a flexible film with self-cleaning and broadband antireflection properties was fabricated with a rapid,straightforward and cost-effective method.The cicada wing was selected as the original te...Inspired by cicada wings,a flexible film with self-cleaning and broadband antireflection properties was fabricated with a rapid,straightforward and cost-effective method.The cicada wing was selected as the original template,and a polymethyl methacrylate (PMMA) negative replica was obtained by evaporation solvent process.The original template was directly peeled off.Subsequently,the polydimethylsiloxane (PDMS) was spread in the as-prepared PMMA negative replica.After curing and peeling processes,the PDMS positive replica was manufactured successfully.The morphologies and performances of cicada wings were perfectly inherited by the PDMS positive replica.What is more,the excellent optical property of cicada wing was investigated experimentally and theoretically.Compared with fiat PDMS film,the average reflectivity of structural PDMS film was reduced from 9% to 3.5% in the wavelength range of 500 nm-900 nm.These excellent antireflection properties of bio-inspired antireflection film can be attributed to the nanostructures which achieve a gradient refractive index between air and the materials,and the mechanism of the antireflection properties was revealed via effective medium theory.Besides,the bio-inspired broadband antireflective film exhibited superhydrophobic property after the surface treatment (a 152.1° water contact angle),and it also displayed satisfactory flexibility.This work provided a universal method to fabricate the exquisite biological structures,realizing the transfer of structure and function.Moreover,the multifunctional antireflection film exhibited the potential value for applications in optical communications,flexible display screens,and anti-dazzle glasses.展开更多
基金supported by National Natural Science Foundation of China(Project No.51672231)Shen Zhen Science and Technology Innovation Commission(Project No.JCYJ20170818114107730)+1 种基金Hong Kong Research Grant Council(General Research Fund Project Nos.16237816,16309018)the support from the Center for 1D/2D Quantum Materials and the State Key Laboratory on Advanced Displays and Optoelectronics at HKUST
文摘An effective and low-cost front-side anti-reflection(AR) technique has long been sought to enhance the performance of highly efficient photovoltaic devices due to its capability of maximizing the light absorption in photovoltaic devices. In order to achieve high throughput fabrication of nanostructured flexible and anti-reflection films, large-scale, nano-engineered wafer molds were fabricated in this work. Additionally, to gain in-depth understanding of the optical and electrical performance enhancement with AR films on polycrystalline Si solar cells, both theoretical and experimental studies were performed. Intriguingly,the nanocone structures demonstrated an efficient light trapping effect which reduced the surface reflection of a solar cell by17.7% and therefore enhanced the overall electric output power of photovoltaic devices by 6% at normal light incidence. Notably, the output power improvement is even more significant at a larger light incident angle which is practically meaningful for daily operation of solar panels. The application of the developed AR films is not only limited to crystalline Si solar cells explored here, but also compatible with any types of photovoltaic technology for performance enhancement.
基金the National Key Research and Development Program of China(No.2018YFA0703300)National Natural Science Foundation of China(Nos.51835006,51875244,51505183,51325501)+5 种基金JLU Science and Technology Innovative Research Team(No.2017TD-04)China Postdoctoral Science Foundation Funded Project(2018T110246)Joint Construction Project of Jilin University and Jilin Province(SXGJSF2017-3)Outstanding Young Talent Fund of Jilin Province(20170520095JH)Scientific and Technological Development Program of Changchun City(Double Ten Project-19SS001)Science and Technology Development Program of Jilin Province(Technology R&D Project-20190302021GX)。
文摘Inspired by cicada wings,a flexible film with self-cleaning and broadband antireflection properties was fabricated with a rapid,straightforward and cost-effective method.The cicada wing was selected as the original template,and a polymethyl methacrylate (PMMA) negative replica was obtained by evaporation solvent process.The original template was directly peeled off.Subsequently,the polydimethylsiloxane (PDMS) was spread in the as-prepared PMMA negative replica.After curing and peeling processes,the PDMS positive replica was manufactured successfully.The morphologies and performances of cicada wings were perfectly inherited by the PDMS positive replica.What is more,the excellent optical property of cicada wing was investigated experimentally and theoretically.Compared with fiat PDMS film,the average reflectivity of structural PDMS film was reduced from 9% to 3.5% in the wavelength range of 500 nm-900 nm.These excellent antireflection properties of bio-inspired antireflection film can be attributed to the nanostructures which achieve a gradient refractive index between air and the materials,and the mechanism of the antireflection properties was revealed via effective medium theory.Besides,the bio-inspired broadband antireflective film exhibited superhydrophobic property after the surface treatment (a 152.1° water contact angle),and it also displayed satisfactory flexibility.This work provided a universal method to fabricate the exquisite biological structures,realizing the transfer of structure and function.Moreover,the multifunctional antireflection film exhibited the potential value for applications in optical communications,flexible display screens,and anti-dazzle glasses.
