Inverted Ultrathin Organic Solar Cells with a Quasi-Grating Structure for Efficient Carrier Collection and Dip-less Visible Optical Absorption

In, Sungjun; Park, Namkyoo

doi:10.1038/srep21784

Cited by 12 publications

(8 citation statements)

References 43 publications

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“…Figure 3 shows the hole (or electron) drift currents under TM illumination (see Figure S7 for TE in the Supporting Information), at short‐circuit current ( V bias = 0 V, Figure 3a,b) and near the open‐circuit condition ( V bias = 0.7 V, Figure 3c,d). When compared to the current densities of the reference device (shown in Figure S8 in the Supporting Information), those of similar distribution and magnitude are observed for both bias conditions (except the minor signature of the modal profile in the distribution of the short‐circuit drift current), confirming that the penalties from the nonuniform photocarrier generation and perturbation in the flow of carriers19, 20, 36 are negligible in this case, where the plasmonics structures are relatively smooth.…”

Section: Resultssupporting

confidence: 58%

“…For this purpose, we perform coupled optical–electrical analysis,19, 20, 21, 22, 23 assuming different values of mobility: at µ e,h , and also at a much larger value of 10 µ e,h ( µ h = 3.58 × 10 −4 cm 2 V −1 S −1 and µ e = 3.42 × 10 −4 cm 2 V −1 S −1 of PBDTT‐F‐TT:PC 71 BM24, 25). Figure 1d presents the J–V characteristic of the UTMF‐electrode reference OSCs, at different combinations of active layer thickness (100 and 270 nm) and mobility values ( µ e,h , 10 µ e,h ).…”

Section: Resultsmentioning

confidence: 99%

“…24, 25. The coupled Poisson, carrier drift‐diffusion, and continuity equations are given by

\nabla^{2} ϕ = - \frac{q (p - n)}{ε}

\frac{\partial n}{\partial t} = D - (1 - Q) R - \frac{n - n_{eq}}{τ_{n}} + \frac{1}{q} \nabla \cdot (q n μ_{n} \nabla ϕ + k_{B} T μ_{n} \nabla n)

\frac{\partial p}{\partial t} = D - (1 - Q) R - \frac{p - p_{eq}}{τ_{p}} - \frac{1}{q} \nabla \cdot (q p μ_{p} \nabla ϕ - k_{B} T μ_{p} \nabla p)

where q is the elementary charge, k B is the Boltzmann constant, φ is the electrostatic potential, D is the Onsager–Braun dissociation (i.e., D = G opt · Q ( x , y , z ) dissociation),44, 45, 46 Q is the local dissociation probability, R is the local recombination rate,19, 20, 21, 44, 45, 46, 47, 48 µ N and µ p are the electron and hole motilities, p and n are the charge carrier densities, p eq and n eq are the equilibrium densities, and τ n and τ p are the lifetimes of the electrons and holes, respectively. The exciton generation rate (in the active layer) was obtained from G opt (λ) = ε″ | E ( x , y , z )|2/2 h– , where ε″ is the imaginary part of the dielectric permittivity, and h– is the reduced Planck constant.…”

Section: Methodsmentioning

confidence: 99%

“…The exciton generation rate (in the active layer) was obtained from G opt (λ) = ε″ | E ( x , y , z )|2/2 h– , where ε″ is the imaginary part of the dielectric permittivity, and h– is the reduced Planck constant. Further details of the optical and electrical simulation can be found in the previous papers,19, 20 and in ref. 21, 22, 23.…”

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Ultrathin Organic Solar Cells with a Power Conversion Efficiency of Over ≈13.0%, Based on the Spatial Corrugation of the Metal Electrode–Cathode Fabry–Perot Cavity

Park

2018

Advanced Science

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The application of nanophotonic structures for organic solar cells (OSCs) is quite popular and successful, and has led to increased optical absorption, better spectral overlap with solar irradiances, and improved charge collection. Significant improvements in the power conversion efficiency (PCE) have also been reported, exceeding 11%. Nonetheless, with the given material properties of OSCs with low optical absorption, narrow spectrum, short transport length of carriers, and nonuniform photocarrier generations resulting from the nanophotonic structure, the PCE of single‐junction OSCs has been stagnant over the past few years, at a barrier of 12%. Here, an ultrathin inverted OSC structure with the highest efficiency of ≈13.0%, while being made from widely used organic materials, is demonstrated. By introducing a smooth spatial corrugation to the vertical plasmonic cavity enclosing the active layer, in‐plane propagation modes and hybridized Fabry–Perot cavity modes inside the corrugated cavity are derived to achieve an ultralow Q, uniform coverage of optical absorption, in addition to uniform photocarrier generation and transport. As the first demonstration of ultra‐broadband absorption with the introduction of spatial corrugation to the ultrathin metal film electrode–cathode Fabry–Perot cavity, future applications of the same concept in other light‐harvesting devices utilizing different materials and structures are expected.

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Section: Resultssupporting

confidence: 58%

Section: Resultsmentioning

confidence: 99%

“…24, 25. The coupled Poisson, carrier drift‐diffusion, and continuity equations are given by

\nabla^{2} ϕ = - \frac{q (p - n)}{ε}

\frac{\partial n}{\partial t} = D - (1 - Q) R - \frac{n - n_{eq}}{τ_{n}} + \frac{1}{q} \nabla \cdot (q n μ_{n} \nabla ϕ + k_{B} T μ_{n} \nabla n)

\frac{\partial p}{\partial t} = D - (1 - Q) R - \frac{p - p_{eq}}{τ_{p}} - \frac{1}{q} \nabla \cdot (q p μ_{p} \nabla ϕ - k_{B} T μ_{p} \nabla p)

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Ultrathin Organic Solar Cells with a Power Conversion Efficiency of Over ≈13.0%, Based on the Spatial Corrugation of the Metal Electrode–Cathode Fabry–Perot Cavity

Park

2018

Advanced Science

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“…Integrating random corrugations or biomimetic structures with quasi-periodic or random geometry in OPVs is another important and effective means to realize broadband polarization-insensitive light harvesting owing to the excitation of broadband and hybrid SPP modes, such as quasi-grating [115], deterministic aperiodic nanostructures (DANs) [116], porous nanocolumnar [100], bioinspired moth's eye nanostructures (MENs) [99,100,117] and ripple structures [118]. For instance, Tang et al have experimentally and theoretically investigated the random biomimetic structures in OPVs.…”

Section: Sppsmentioning

confidence: 99%

Nanostructures induced light harvesting enhancement in organic photovoltaics

Feng

et al. 2017

Nanophotonics

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Lightweight and low-cost organic photovoltaics (OPVs) hold great promise as renewable energy sources. The most critical challenge in developing high-performance OPVs is the incomplete photon absorption due to the low diffusion length of the carrier in organic semiconductors. To date, various attempts have been carried out to improve light absorption in thin photoactive layer based on optical engineering strategies. Nanostructureinduced light harvesting in OPVs offers an attractive solution to realize high-performance OPVs, via the effects of antireflection, plasmonic scattering, surface plasmon polarization, localized surface plasmon resonance and optical cavity. In this review article, we summarize recent advances in nanostructure-induced light harvesting in OPVs and discuss various light-trapping strategies by incorporating nanostructures in OPVs and the fabrication processing of the micro-patterns with high resolution, large area, high yield and low cost.

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Dispersion‐Controlled Gold–Aluminum–Silicon Dioxide–Aluminum Nanopawn Structures for Visible to NIR Light Modulation

Park

2021

Advanced Materials

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As an efficient patterning method for nanostructures, nanocolloidal lithography (NCL) presents a controllable and scalable means for achieving a uniform and good sidewall profile, and a high aspect ratio. While high selectivity between the etching mask and targeted materials is also essential for NCL‐based precision nanophotonic structures, its realization in multi‐material nanophotonic structures still remains a challenge due to the dielectric‐ or metallic‐material‐dependent etching selectivity. Here, dispersion‐controlled Au‐NCL is proposed, which enables high selectivity for Al and SiO2 over a Au nanoparticle (Au‐NP) mask. Utilizing the proposed process, wafer‐scale, uniformly dispersed multi‐material nanopawn structures (Au‐NPs/Al–SiO2 cylinders) on an Al ultrathin film are realized, obtaining excellent vertical sidewall (≈90°) and aspect ratio (>1). The high sidewall verticality and aspect ratio of the nanopawn structures support optical modes highly sensitive to the excitation direction of incident waves through the mixing of the interface‐gap‐assisted localized surface plasmons (GLSPs) formed in between the Au‐NP and Al‐disk interface, and plasmonic Fabry–Pérot (FP) modes formed in between the Al‐disk and Al substrate; complementary spectral responses between reflected and scattered light are also demonstrated. As an application example, information encryption based on the triple‐channel (i.e., reflection, scattering, and transmission) angle‐dependent complementary‐color responses is presented.

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Inverted Ultrathin Organic Solar Cells with a Quasi-Grating Structure for Efficient Carrier Collection and Dip-less Visible Optical Absorption

Cited by 12 publications

References 43 publications

Ultrathin Organic Solar Cells with a Power Conversion Efficiency of Over ≈13.0%, Based on the Spatial Corrugation of the Metal Electrode–Cathode Fabry–Perot Cavity

Ultrathin Organic Solar Cells with a Power Conversion Efficiency of Over ≈13.0%, Based on the Spatial Corrugation of the Metal Electrode–Cathode Fabry–Perot Cavity

Nanostructures induced light harvesting enhancement in organic photovoltaics

Dispersion‐Controlled Gold–Aluminum–Silicon Dioxide–Aluminum Nanopawn Structures for Visible to NIR Light Modulation

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