scholarly journals Optical Model and Optimization for Coherent-Incoherent Hybrid Organic Solar Cells with Nanostructures

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3187
Author(s):  
Xuenan Zhao ◽  
Honggang Gu ◽  
Linya Chen ◽  
Shiyuan Liu
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Optical Model ◽  
Absorption Efficiency ◽  
Geometrical Parameters ◽  
Active Layer Thickness ◽  
Multiple Reflections ◽  
Rigorous Coupled Wave Analysis ◽  
Scattering Effects ◽  
Rigorous Coupled Wave

Embedding nanostructures in organic solar cells (OSCs) is a well-known method to improve the absorption efficiency of the device by introducing the plasma resonance and scattering effects without increasing the active layer thickness. The introduction of nanostructures imposes greater demands on the optical analysis method for OSCs. In this paper, the generalized rigorous coupled-wave analysis (GRCWA) is presented to analyze and optimize the performance of coherent-incoherent hybrid organic solar cells (OSCs) with nanostructures. Considering the multiple reflections of light scattered within the glass substrate by the device, the correction vector g is derived, then the modified expressions for the field and absorption distribution in OSCs are provided. The proposed method is validated by comparing the simulated results of various structures with results obtained by the generalized transfer matrix method (GTMM) and the “equispaced thickness method” (ETM). The results demonstrate that the proposed method can reduce the number of simulations by at least half compared to the ETM while maintaining accuracy. With the proposed method, we discussed the device performance depending on the geometrical parameters of nanostructures, and the optimization and analysis are accomplished for single and tandem OSCs. After optimization based on the proposed method, the performance of OSCs are significantly improved, which further demonstrates the practicality of the method.

Vertically Optimized Phase Separation with Improved Exciton Diffusion Enables High-Efficiency Organic Solar Cells with Thick Active Layers

2021 ◽  
Author(s):  
Yanming Sun ◽  
Yunhao Cai ◽  
Qian Li ◽  
Guanyu Lu ◽  
Hwa Sook Ryu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Phase Separation ◽  
Active Layer ◽  
Organic Solar Cells ◽  
High Efficiency ◽  
Diffusion Length ◽  
Active Layer Thickness ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length ◽  
Active Layers

Abstract The development of high-performance organic solar cells (OSCs) with thick active layers is of crucial importance for the roll-to-roll printing of large-area solar panels. Unfortunately, increasing the active layer thickness usually results in a significant reduction in efficiency. Herein, we fabricated efficient thick-film OSCs with an active layer consisting of one polymer donor and two non-fullerene acceptors. The two acceptors were found to possess enlarged exciton diffusion length in the mixed phase, which is beneficial to exciton generation and dissociation. Additionally, layer by layer approach was employed to optimize the vertical phase separation. Benefiting from the synergetic effects of enlarged exciton diffusion length and graded vertical phase separation, a record high efficiency of 17.31% (certified value of 16.9%) was obtained for the 300 nm-thick OSC, with an unprecedented short-circuit current density of 28.36 mA cm−2, and a high fill factor of 73.0%. Moreover, the device with an active layer thickness of 500 nm also shows a record efficiency of 15.21%. This work provides new insights into the fabrication of high-efficiency OSCs with thick active layers.

Active layer thickness effect on the recombination process of PCDTBT:PC71BM organic solar cells

2013 ◽  
Vol 14 (1) ◽  
pp. 74-79 ◽  
Author(s):  
Gon Namkoong ◽  
Jaemin Kong ◽  
Matthew Samson ◽  
In-Wook Hwang ◽  
Kwanghee Lee
Keyword(s):  
Solar Cells ◽  
Layer Thickness ◽  
Active Layer ◽  
Organic Solar Cells ◽  
Recombination Process ◽  
Thickness Effect ◽  
Active Layer Thickness

Application of Electrochemical Impedance Spectroscopy in Organic Solar Cells with Vertically Aligned TiO2 Nanorod Arrays as Buffer Layer

2012 ◽  
Vol 512-515 ◽  
pp. 1598-1603
Author(s):  
Yong Chang Zhang ◽  
Xing Jian Jiao ◽  
Chen Zhou ◽  
He Ping Shen ◽  
Feng Hao ◽  
...  
Keyword(s):  
Solar Cells ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Buffer Layer ◽  
Organic Solar Cells ◽  
Electrochemical Impedance ◽  
Short Circuit ◽  
Photovoltaic Performance ◽  
Active Layer Thickness ◽  
Nanorod Arrays

Single-crystal TiO2 nanorod film was synthesized directly on FTO substrates with various lengths by changing the hydrothermal growth parameters including growth time and growth temperature. The obtained nanorod arrays were incorporated in organic solar cells as buffer layer instead of PEDOT: PSS. Results showed that devices assembled with TiO2 nanorods film of 200 nm in length exhibited a lower open-circuit voltage but a significantly higher short-circuit current density compared to those of normal FTO/PEDOT: PSS/P3HT: PCBM/Al structure with a comparable active layer thickness. Overall the power conversion efficiency was boosted by two-fold. Electrochemical impedance spectroscopy (EIS) analyses revealed that the improvement in the photovoltaic performance was induced by the inhibited recombination and consequently enhanced electron lifetime.

scholarly journals Graphene-Based Cylindrical Pillar Gratings for Polarization-Insensitive Optical Absorbers

2019 ◽  
Vol 9 (12) ◽  
pp. 2528 ◽  
Author(s):  
Muhammad Fayyaz Kashif ◽  
Giuseppe Valerio Bianco ◽  
Tiziana Stomeo ◽  
Maria Antonietta Vincenti ◽  
Domenico de Ceglia ◽  
...  
Keyword(s):  
Near Infrared ◽  
Monolayer Graphene ◽  
Geometrical Parameters ◽  
Guided Mode ◽  
Rigorous Coupled Wave Analysis ◽  
Dielectric Gratings ◽  
Method Effects ◽  
Polarization Insensitive ◽  
Rigorous Coupled Wave ◽  
Infrared Frequencies

In this study, we present a two-dimensional dielectric grating which allows achieving high absorption in a monolayer graphene at visible and near-infrared frequencies. Dielectric gratings create guided-mode resonances that are exploited to effectively couple light with the graphene layer. The proposed structure was numerically analyzed through a rigorous coupled-wave analysis method. Effects of geometrical parameters and response to the oblique incidence of the plane wave were studied. Numerical results reveal that light absorption in the proposed structure is almost insensitive to the angle of the impinging source over a considerable wide angular range of 20°. This may lead to the development of easy to fabricate and experimentally viable graphene-based absorbers in the future.

scholarly journals Application of Plasmonic Nanoantennas in Enhancing the Efficiency of Organic Solar Cells

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Marcelino L. C. da Silva ◽  
Victor Dmitriev ◽  
Karlo Q. da Costa
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Solar Cells ◽  
Organic Solar Cells ◽  
Parametric Analysis ◽  
Organic Solar Cell ◽  
Absorption Efficiency ◽  
The Finite Element Method ◽  
Truncated Cone ◽  
Plasmonic Nanoantennas

It is known that the periodic use of silver nanoantennas in organic solar cells increases the efficiency of light absorption. In this study, we performed a geometric parametric analysis of nanoantennas using the finite element method. Based on the study of the convex truncated cone nanoantenna, we have found that a nanoantenna arrangement formed by the convex truncated cone nanoantenna along with a pyramidal nanoantenna provides a better solution for different angles of light incidence compared to a single nanoantenna. We obtained a mean increase in the absorption efficiency of this organic solar cell, both for the TM and TE polarizations, compared to the use of the conventional nanoantenna in the wavelength range of 300–800 nm.

scholarly journals Charge carrier transport and contact selectivity limit the operation of PTB7-based organic solar cells of varying active layer thickness

2013 ◽  
Vol 1 (39) ◽  
pp. 12345 ◽  
Author(s):  
Antonio Guerrero ◽  
Núria F. Montcada ◽  
Jon Ajuria ◽  
Ikerne Etxebarria ◽  
Roberto Pacios ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Carrier ◽  
Layer Thickness ◽  
Active Layer ◽  
Organic Solar Cells ◽  
Carrier Transport ◽  
Active Layer Thickness ◽  
Charge Carrier Transport

Study of the Absorptance of Si-gratings and of arrays of SiO2-filled trenches on Si-grating substrate

2016 ◽  
Vol 12 (2) ◽  
pp. 4278-4290
Author(s):  
Faouzi Ghmari ◽  
Ilhem Mezni
Keyword(s):  
Transverse Electric ◽  
Transverse Magnetic ◽  
Radiative Properties ◽  
Geometrical Parameters ◽  
Perfect Absorber ◽  
Angle Of Incidence ◽  
Patterned Wafers ◽  
Rigorous Coupled Wave Analysis ◽  
Rigorous Coupled Wave ◽  
Model Structures

The purpose of this paper is to study the radiative properties of two model structures. The first model (A-1) is a rectangular grating of silicon (Si). The second one (A-2) is obtained from A-1 by filling their trenches by SiO2. These patterned wafers are characterized by three geometrical parameters, the period d, the filling factorand the thickness h. To derive and compute the radiative properties we use a rigorous coupled wave analysis (RCWA) method. Our attention is focused on the absorptance of these structures when they are illuminated by a monochromatic plane wave. We investigate the effect of the filling factor on the absorptance versus the direction of the incident wave. At specific angles of incidence the effect of the period is also studied. Besides, the influence of the thickness h on the absorptance is included throughout this work. At the wavelength = 632,8nm, we especially show that we can identify several perfect absorber model structures characterized by specific parameters and by accurate angle of incidence. We show that this will be done in both transverse electric (TE) and transverse magnetic (TM) polarization cases.

Fine Tuning the Optoelectronic Properties of Triphenylamine Based Donor Molecules for Organic Solar Cells

2017 ◽  
Vol 231 (6) ◽  
Author(s):  
Muhammad Adnan ◽  
Javed Iqbal ◽  
Shamsa BiBi ◽  
Riaz Hussain ◽  
Muhammad Nadeem Akhtar ◽  
...  
Keyword(s):  
Solar Cells ◽  
Electron Donor ◽  
Organic Solar Cells ◽  
Electronic Structures ◽  
Photophysical Properties ◽  
Optoelectronic Properties ◽  
Fine Tuning ◽  
Geometrical Parameters

AbstractGeometrical parameters, electronic structures and photophysical properties of three new triphenylamine (TPA) and diphenylamine (DPA) based electron donor materials

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