Resonance-induced absorption enhancement in colloidal quantum dot solar cells using nanostructured electrodes

Mahpeykar, Seyed Milad; Xiong, Qiuyang; Wang, Xihua

doi:10.1364/oe.22.0a1576

Cited by 24 publications

(16 citation statements)

References 26 publications

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“…. ) toward different directions at the grating interface [36]. Figure 5a,b show the light diffracted and reflected by the flat mp-TiO 2 and the 1D GNP mp-TiO 2 , respectively, using a He-Ne laser (632.8 nm).…”

Section: Resultsmentioning

confidence: 99%

“…As illustrated in Figure 5 c, the incident light is diffracted into multiple orders of transmitted and reflected light (m = …, −2, –1, 0, 1, 2, …) toward different directions at the grating interface [ 36 ]. Figure 5 a,b show the light diffracted and reflected by the flat mp-TiO 2 and the 1D GNP mp-TiO 2 , respectively, using a He–Ne laser (632.8 nm).…”

Section: Resultsmentioning

confidence: 99%

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Enhanced Light Absorption by Facile Patterning of Nano-Grating on Mesoporous TiO2 Photoelectrode for Cesium Lead Halide Perovskite Solar Cells

Kim

Kwon

et al. 2021

Nanomaterials

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CsPbIBr2, a cesium-based all-inorganic halide perovskite (CsPe), is a very promising alternative material to mainstream organic–inorganic hybrid halide perovskite (HPe) materials owing to its exceptional moisture stability, thermal stability, and light stability. However, because of the wide band gap (2.05 eV) of CsPbIBr2, it has a low power conversion efficiency (PCE), which hinders its application in highly efficient solar cells. In this study, a facile nanoimprinted one-dimensional grating nanopattern (1D GNP) formation on mesoporous TiO2 (mp-TiO2) photoelectrodes was introduced to improve the effective light utilization and enhance the performance of CsPbIBr2 perovskite solar cells (PSCs). The 1D GNP structure on the mp-TiO2 layer increases the light absorption efficiency by diffracting the unabsorbed light into the active mp-TiO2 and CsPbIBr2 layers as well as increasing the charge separation and collection due to the extended interfacial contact area between the mp-TiO2 and CsPbIBr2 layers. Consequently, both the current density (JSC) and the fill factor (FF) of the fabricated cells improved, leading to over a 20% enhancement in the solar cell’s PCE. Thus, this periodic grating structure, fabricated by simple nanoimprinting, could play an important role in the large-scale production of highly efficient and cost-effective Cs-based PSCs.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Enhanced Light Absorption by Facile Patterning of Nano-Grating on Mesoporous TiO2 Photoelectrode for Cesium Lead Halide Perovskite Solar Cells

Kim

Kwon

et al. 2021

Nanomaterials

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“…5(c). Each order represents a different direction for the scattered light, and the zeroth order (m = 0) represents the light scattered in the same direction as the incident light [33]. Fig.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Light Absorption by Facile Patterning of Nano-grating on Mesoporous TiO2 Photoelectrode for Cesium Lead Halide Perovskite Solar Cells

Woo

Kim

Kwon

et al. 2020

Preprint

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CsPbIBr2, a type of cesium based all-inorganic halide perovskite (CsPe) composition, has been proposed as an alternative perovskite material against the mainstream organic–inorganic hybrid halide perovskite (HPe) materials owing to its exceptional humidity, thermal, temperature, and light stability. However, the low power conversion efficiency (PCE) due to its wide bandgap (2.05 eV) is an obstacle for its application in developing highly efficient solar cells. In this study, facile nanoimprinted one-dimensional grating nanopattern (1D GNP) formation on mesoporous TiO2 (mp-TiO2) photoelectrode has been introduced to improve the effective light utilization for enhancing the performance of CsPbIBr2 perovskite solar cells (PSCs). The 1D GNP structure on mp-TiO2 layer can not only increase the light absorption efficiency by diffracting the unabsorbed light into the mp-TiO2 and CsPbIBr2 active layer, but can also increase the charge separation and collection due to the enlarged interfacial contact area between the mp-TiO2 and CsPbIBr2 layers. Consequently, both current density (JSC) and fill factor (FF) of the fabricated cells were improved leading to over 20% improvement in their PCE. Thus, we conclude that this periodic grating structure, fabricated by simple solvent-assisted nanoimprinting, can play an important role in the realization of high-efficiency and low-cost Cs-based PSCs.

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confidence: 99%

Cellulose Nanocrystal:Polymer Hybrid Optical Diffusers for Index‐Matching‐Free Light Management in Optoelectronic Devices

Mahpeykar

Zhao

et al. 2017

Advanced Optical Materials

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exploited for the purpose of uniform backlighting, brightness enhancement, efficiency improvement, and increased sensitivity in liquid crystal displays (LCDs), [1][2][3] light-emitting diodes (LEDs), [4][5][6] solar cells, [7][8][9] and photodetectors, [10][11][12] all via excellent light scattering properties of optical diffusers.As a nontoxic and biodegradable material, cellulose nanocrystals (CNCs) are environment friendly. They are directly extracted from natural resources such as wood and other fiber supplies available in plants. As a high-molecular-weight linear polymer formed of monomers linked together by glycosidic oxygen bridges, [13] they offer desirable bulk and nanoscale properties (e.g., high tensile strength, high surface area for interaction with surrounding species) [14] that make them suited for use as substrates in devices such as sensors, [15] solar cells, [16] LEDs, [17] and transistors. [18] In addition, recently, cellulose nanofiber (CNF)-based films and papers have attracted attention for their light scattering capabilities. [9,19,20] Both CNCs and CNFs are very similar in terms of chemical composition and can be derived from the same source but are morphologically different in that CNFs are long (in order of micrometers) and flexible composed of both crystalline and amorphous parts while CNCs are short rod-like crystals with lengths in the range of a few hundreds of nanometers. [21] Here, we propose, fabricate, and characterize a new class of optical diffusers based on CNP hybrid films. While some of the recently proposed volumetric diffusers are made of rare earth materials such as cerium [22] which can drive up the cost of fabrication, the proposed diffuser relies on a ubiquitous and environment-friendly material, cellulose, which is cost-effective to produce. Our hybrid diffuser achieves high haze values (up to 85%), which is significantly higher than cellulose nanofiber/ wood pulp diffusers, [9,20] while maintaining a high degree of transparency (≈85%). In addition, unlike previously reported cellulose nanofiber/wood pulp optical diffusers which require an additional index-matching layer between the diffuser and the device for efficient light coupling, [9,20] no index-matching is required for the diffuser here due to the hydrophobic surfaces A novel optical diffuser based on cellulose nanocrystals (CNCs) embedded in polydimethylsiloxane (PDMS) matrix, or cellulose nanocrystal:polymer (CNP) is reported. By offering simple low-cost fabrication process as well as compatibility with large-scale production, the proposed optical diffuser is a better choice for integration into optoelectronic devices for light management compared to other cellulose-based diffusers due to its physical durability and the lack of requirement for index-matching between the diffuser and the optoelectronic device thanks to the unique surface properties, mechanical flexibility, and optical transparency offered by PDMS as the matrix material. It is demonstrated that CNCs are an excellent filler material to pair up w...

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Resonance-induced absorption enhancement in colloidal quantum dot solar cells using nanostructured electrodes

Cited by 24 publications

References 26 publications

Enhanced Light Absorption by Facile Patterning of Nano-Grating on Mesoporous TiO2 Photoelectrode for Cesium Lead Halide Perovskite Solar Cells

Enhanced Light Absorption by Facile Patterning of Nano-Grating on Mesoporous TiO2 Photoelectrode for Cesium Lead Halide Perovskite Solar Cells

Enhanced Light Absorption by Facile Patterning of Nano-grating on Mesoporous TiO2 Photoelectrode for Cesium Lead Halide Perovskite Solar Cells

Cellulose Nanocrystal:Polymer Hybrid Optical Diffusers for Index‐Matching‐Free Light Management in Optoelectronic Devices

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