Optical Tamm states enhanced broad-band absorption of organic solar cells

Zhang, Xu‐Lin; Song, Jun-Feng; Li, Xianbin; Feng, Jing; Sun, Hong–Bo

doi:10.1063/1.4770316

Cited by 106 publications

(64 citation statements)

References 18 publications

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“…For example, in ultra-thin absorber layers, a new physical mechanism for light absorption enhancement using DBRs emerges. In [ 147 ], the authors propose forming a DBR from ITO and ATO layers in the front transparent conducting electrode. Unlike the previous studies we have discussed, the DBR is not used as a back reflector.…”

Section: Front-side Photonic Crystalsmentioning

confidence: 99%

Nanostructures for photon management in solar cells

Narasimhan

Cui

2013

Nanophotonics

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Abstract:The concurrent development of high-performance materials, new device and system architectures, and nanofabrication processes has driven widespread research and development in the field of nanostructures for photon management in photovoltaics. The fundamental goals of photon management are to reduce incident light reflection, improve absorption, and tailor the optical properties of a device for use in different types of energy conversion systems. Nanostructures rely on a core set of phenomena to attain these goals, including gradation of the refractive index, coupling to waveguide modes through surface structuring, and modification of the photonic band structure of a device. In this review, we present recent developments in the field of nanostructures for photon management in solar cells with applications across different materials and system architectures. We focus both on theoretical and numerical studies and on progress in fabricating solar cells containing photonic nanostructures. We show that nanoscale light management structures have yielded real efficiency gains in many types of photovoltaic devices; however, we note that important work remains to ensure that improved optical performance does not come at the expense of poor electrical properties.

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Section: Front-side Photonic Crystalsmentioning

confidence: 99%

Nanostructures for photon management in solar cells

Narasimhan

Cui

2013

Nanophotonics

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“…Fields are confined and amplified at the metal/PC interface due to the interference of light reflected from both sides. Owing to the strong field enhancement, applications such as lasers [23,24], all-optical switches [25], solar cells [26], Faraday rotation [27,28] and electromagnetically induced transparency (EIT) [29] have been proposed.In this letter, we introduce and demonstrate a type of Tamm states in plasmonic metal-insulator-metal (MIM) waveguides. In analogy with OTSs in an optical system, such states exist in a plasmonic system, as which we call plasmonic Tamm states (PTSs).…”

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confidence: 99%

Plasmonic Tamm states: dual enhancement of light inside the plasmonic waveguide

et al. 2014

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A type of Tamm states inside metal-insulator-metal (MIM) waveguides is proposed. An impedance based transfer matrix method is adopted to study and optimize it. With the participation of the plasmonic Tamm states, fields could be enhanced twice: the first is due to the coupling between a normal waveguide and a nanoscaled plasmonic waveguide and the second is due to the strong localization and field enhancement of Tamm states. As shown in our 2D coupling configuration, |E| 2 is enhanced up to 1050 times when 1550 nm light is coupled from an 300 nm Si slab waveguide into an 40 nm MIM waveguide. Optical Tamm states (OTSs, also known as Tamm plasmons), was recently discovered at the interface between a metal film and an 1D photonic crystal (PC) [21,22]. Unlike the only TM-polarized SPPs, OTSs can be excited directly by normal incidence for both TM and TE-polarized waves. The light frequency lies in the band gap of the PC. Fields are confined and amplified at the metal/PC interface due to the interference of light reflected from both sides. Owing to the strong field enhancement, applications such as lasers [23,24], all-optical switches [25], solar cells [26], Faraday rotation [27,28] and electromagnetically induced transparency (EIT) [29] have been proposed.In this letter, we introduce and demonstrate a type of Tamm states in plasmonic metal-insulator-metal (MIM) waveguides. In analogy with OTSs in an optical system, such states exist in a plasmonic system, as which we call plasmonic Tamm states (PTSs). We form Bragg reflectors (BR) by periodically change the dielectric materials in MIM [30]. Only if the phase matching condition r left r right = 1 is fulfilled, PTSs can be generated in accompany with fields enhancement at the interface between the MIM BR and the MIM end [21]. Hence, fields can be enlarged twice during the focusing process: the first enhancement is due to the coupling between a normal dielectric waveguide and a nanoscaled MIM waveguide and the second enhancement is due to the strong localization and amplification of PTSs. Fig. 1. Sketch of the plasmonic Tamm states generation configuration. In order to fulfill the phase matching condition, ε 2 should be larger than ε 1 .The scheme of the PTSs generation configuration is illustrated in Fig. 1. SPPs are excited at the left side. The operation wavelength is 1550 nm. The dielectric core has a width of w = 40 nm. In this regime, the odd TM mode (E x is odd, E y and H z are even) is the only mode of this MIM structure with a dispersion relation [4]where ε m and ε d are the dielectric constants of the metal and the dielectric, respectively. k m and k d denote the re-1 arXiv:1401.5230v1 [physics.optics]

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“…Экспериментально эти локализованные состояния проявляются в виде узкого резонанса в оптическом спектре пропускания или отражения образца [6]. Среди предложенных и реализованных применений ОТС отметим органические солнечные элементы [7], лазеры [8], сенсоры [9], поглотители [10].…”

Section: Email: Makspyatnov@yandexruunclassified