An integrated antireflection design using nanotexture and high-refractive-index glass for organic photovoltaics / Shigeru Kubota in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 5 (09/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 5 (09/2017) . - p. 1209-1224 Titre : An integrated antireflection design using nanotexture and high-refractive-index glass for organic photovoltaics Type de document : texte imprimé Auteurs : Shigeru Kubota, Auteur ; Yoshiki Harada, Auteur ; Takenari Sudo, Auteur ; Kensaku Kanomata, Auteur ; Bashir Ahmmad, Auteur ; Jun Mizuno, Auteur ; Fumihiko Hirose, Auteur Année de publication : 2017 Article en page(s) : p. 1209-1224 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Photopiles Revêtement antireflet Verre Index. décimale : 667.9 Revêtements et enduits Résumé : We propose a new antireflection (AR) design for organic photovoltaics (OPVs) to achieve broadband and omnidirectional enhancement of photocurrent. In the proposed design, a hybrid AR structure, which combines moth eye texturing and two-layer interference coating, is integrated with a glass substrate having a high refractive index (n). Using the optical simulation for OPV cells, we compare the performance of various AR configurations upon changing the refractive index of the glass substrate. We show that the short-circuit current density (JSC) is decreased by using the high-n glass substrate without AR coating, whereas JSC is significantly increased by applying the high-n glass substrate with the hybrid AR structure, suggesting an importance of the integrated design. In addition, we demonstrate that the proposed AR configuration is quite effective to attain broad angle performance and is robust against the variations in geometric features of moth eye texture. Finally, the spectral dependence of photocurrent generation is experimentally measured for the verification of the effectiveness of the integrated AR design. These results provide a practical and efficient AR technique that can further expand the potential of OPVs as energy supply devices. Note de contenu : - EXPERIMENTAL : Optical modeling - Effective medium approximation - Characteristic matrix-based analysis - Incident light condition - Device fabrication and testing - RESULTS AND DISCUSSION : Effectiveness of the AR design with hybrid ARS and high-n glass substrate - Wide-angle AR performance - Robustness against variations in geometric features of moth eye structure - Photocurrent loss by the absorption in glass substrate - Experimental testing DOI : 10.1007/s11998-017-9914-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9914-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29154 [article]

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Hybrid antireflection structure with moth eye and multilayer coating for organic photovoltaics / Shigeru Kubota in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 1 (01/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 1 (01/2015) . - p. 34-47 Titre : Hybrid antireflection structure with moth eye and multilayer coating for organic photovoltaics Type de document : texte imprimé Auteurs : Shigeru Kubota, Auteur ; Kensaku Kanomata, Auteur ; Takahiko Suzuki, Auteur ; Bashir Ahmmad, Auteur ; Fumihiko Hirose, Auteur Année de publication : 2015 Article en page(s) : p. 34-47 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Matériaux organiques Photopiles Revêtement antireflet Revêtements multicouches Index. décimale : 667.9 Revêtements et enduits Résumé : We propose a hybrid antireflection structure (ARS), which integrates moth eye texturing and multilayer interference coating, to improve efficiency of organic photovoltaic (OPV) solar cells. We perform nearly global optimization of the geometric parameters characterizing the hybrid ARS, by using optical simulations based on the finite-difference time-domain method. The proposed optimization algorithm consists of two steps: in the first step, only the moth eye structure is globally optimized and, in the second step, the whole hybrid structure is optimized efficiently based on the results of the first step. Thus, the optimal moth eye structure is additionally obtained as an intermediate result. By applying this optimization method to an organic thin film solar cell, we show that the short-circuit current density (J SC) is increased by 8.90% with the moth eye structure and by 9.89% with the hybrid ARS. We also study the sensitivity of photocurrent to the geometric parameters of hybrid ARS, and the change in the spatial distribution of electric field intensity by the ARS. The results show that the hybridization of the two types of light trapping techniques is effective to reduce the inhomogeneity in the electric field distribution and obtain higher electric intensity in almost the whole active layer. The design concept of the hybrid ARS is quite useful for improving light trapping in OPVs and allows for extending the options available for broadband antireflection. Note de contenu : - EXPERIMENTAL : Optical model - Optimization algorithm - RESULTS AND DISCUSSION : Optimization of hybrid ARS - Optical properties of the optimized ARS DOI : 10.1007/s11998-014-9614-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9614-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23205 [article]

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Optimized design of moth eye antireflection structure for organic photovoltaics / Shigeru Kubota in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 1 (01/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 1 (01/2016) . - p. 201-210 Titre : Optimized design of moth eye antireflection structure for organic photovoltaics Type de document : texte imprimé Auteurs : Shigeru Kubota, Auteur ; Kensaku Kanomata, Auteur ; Bashir Ahmmad, Auteur ; Jun Mizuno, Auteur ; Fumihiko Hirose, Auteur Année de publication : 2016 Article en page(s) : p. 201-210 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Différences finies dans le domaine temporel FDTD est l'acronyme de l'expression anglaise Finite Difference Time Domain. C'est une méthode de calcul de différences finies dans le domaine temporel, qui permet de résoudre des équations différentielles dépendantes du temps. Cette méthode est couramment utilisée en électromagnétisme pour résoudre les équations de Maxwell. Cette méthode a été proposée par Kane S. Yee en 1966. Photopiles Revêtement antireflet Index. décimale : 667.9 Revêtements et enduits Résumé : To improve the power conversion efficacy of organic photovoltaics (OPVs), it is required to design antireflection structures that could realize efficient and broadband light trapping. In this article, we perform global optimization of the textured pattern of moth eye antireflection surfaces to maximize the short-circuit current density (J SC) of OPVs with a poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM)-based bulk heterojunction. We introduce an optimization algorithm consisting of two steps: in the first step, the simple grid search is conducted to roughly estimate a globally optimal solution, while in the second step, the Hooke and Jeeves pattern search is executed to refine the solution. By combining the optimization algorithm with the optical simulation based on the finite-difference time-domain method, we find the optimal period and height of moth eye array with which the level of J SC can be increased by 9.05% in the P3HT:PCBM-based organic solar cell. We also demonstrate that the optimized moth eye structure can significantly modify the light path at a long wavelength range to strengthen the electric field intensity and enhance energy absorption within the active layer. Note de contenu : - EXPERIMENTAL : Optical model - FDTD simulation - Characteristic matrix-based analysis - Optimization algorithm - RESULTS AND DISCUSSION : FDTD simulation in the presence of thick glass substrate - Optimization of moth eye texture - APPENDIX : Method for removing artificial interférence effect from FDTD response DOI : 10.1007/s11998-015-9745-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9745-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25389 [article]

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