Simultaneous determination of electron and hole drift mobilities in working inverted organic solar cells: modulated photocurrent spectroscopy versus impedance spectroscopy

2020 ◽  
Vol 59 (6) ◽  
pp. 064002
Author(s):  
Yo Kumoda ◽  
Emi Nakatsuka ◽  
Kiyohito Mori ◽  
Hiroki Nojima ◽  
Takashi Kobayashi ◽  
...  
Keyword(s):  
Solar Cells ◽  
Impedance Spectroscopy ◽  
Simultaneous Determination ◽  
Organic Solar Cells ◽  
Photocurrent Spectroscopy

scholarly journals Modulated Photocurrent Spectroscopy for Determination of Electron and Hole Mobilities in Working Organic Solar Cells

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Hiroki Nojima ◽  
Takashi Kobayashi ◽  
Takashi Nagase ◽  
Hiroyoshi Naito
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Power Conversion ◽  
Physical Constant ◽  
Mixing Ratio ◽  
Photocurrent Spectroscopy ◽  
Donor And Acceptor ◽  
Device Structures ◽  
Electron Donor And Acceptor

AbstractCarrier drift mobility is an important physical constant in the charge transport process of organic solar cells (OSCs). Although time-of-flight and space-charge-limited current techniques have been frequently utilized for mobility measurements, the validity of a new method using modulation photocurrent spectroscopy is discussed in this contribution. The advantages of this method are its applicability to working OSCs with optimized device structures and the simultaneous determination of the electron and hole mobilities. These features make it possible to study the relation between the mobility balance and the solar cell characteristics, such as the power conversion efficiency, using only a single working OSC; hence, it is not necessary to fabricate electron-only and hole-only devices for mobility measurements. After carrying out numerical simulations to examine the validity of this method for mobility determination, the dependence of the mobility balance on the mixing ratio of the electron-donor and –acceptor materials is presented.

Fabrication and characterization of CuPc and PCBM based organic solar cell with metal interlayer

2015 ◽  
Vol 12 (5) ◽  
pp. 413-420
Author(s):  
Muhammad Ahsan Naveed ◽  
A. Hussain ◽  
K. Islam ◽  
P. Akhter
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Impedance Spectroscopy ◽  
Organic Solar Cells ◽  
Organic Solar Cell ◽  
Silver Layer ◽  
Absorbance Spectrum ◽  
Heterojunction Solar Cells ◽  
Processing Cost ◽  
Donor Acceptor

Organic solar cells have potential as an alternative to conventional inorganic solar cell due to low processing cost, flexibility and easy fabrication technique. The goal of this paper is to study the characteristics of the CuPc and PCBM based organic solar cell by introducing a thin layer of Ag at the interface of donor (CuPc) and Acceptor (PCBM), their photovoltaic and optical properties were investigated. The heterojunction solar cells with and without silver inter layer were fabricated through thermal deposition in HR vacuum. The OPV solar cells were characterized using current-voltage graphs, absorbance spectrum and Impedance spectroscopy. Impedance spectroscopy was taken to identify the traps using series resistance, parallel resistance, and Impedance spectrums under different frequencies. Optical behaviors of these devices have been investigated with absorbance spectrum. Introducing Ag to interfacing point produced traps and these traps causes to decreased Voc, Isc, FF, and efficiency. The effect of silver layer at donor acceptor interface was studied.

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 Charge transfer state characterization and voltage losses of organic solar cells

2021 ◽  
Author(s):  
Anna Jungbluth ◽  
Pascal Kaienburg ◽  
Moritz Riede
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Organic Solar Cells ◽  
Detailed Balance ◽  
Open Circuit ◽  
Theory Approach ◽  
Emission Data ◽  
Correct Determination ◽  
Improved Performance

Abstract A correct determination of voltage losses is crucial for the development of organic solar cells with improved performance. This requires an in-depth understanding of the properties of interfacial charge transfer (CT) states, which not only set the upper limit for the open-circuit voltage of a system, but also govern radiative and non-radiative recombination processes. Over the last decade, different approaches have emerged to classify voltage losses in organic solar cells that rely on a generic detailed balance approach or additionally include CT state parameters that are specific to organic solar cells. In the latter case, a correct determination of CT state properties is paramount. In this work, we summarize the different frameworks used today to calculate voltage losses and provide an in-depth discussion of the currently most important models used to characterize CT state properties from absorption and emission data of organic thin films and solar cells. We also address practical concerns during the data recording, analysis, and fitting process. Departing from the classical two-state Marcus theory approach, we discuss the importance of quantized molecular vibrations and energetic hybridization effects in organic donor-acceptor systems with the goal to providing the reader with a detailed understanding of when each model is most appropriate.

Circuital Model Validation for S-Shaped Organic Solar Cells by Means of Impedance Spectroscopy

2015 ◽  
Vol 5 (1) ◽  
pp. 234-237 ◽  
Author(s):  
B. Romero ◽  
G. del Pozo ◽  
B. Arredondo ◽  
J. P. Reinhardt ◽  
M. Sessler ◽  
...  
Keyword(s):  
Solar Cells ◽  
Impedance Spectroscopy ◽  
Model Validation ◽  
Organic Solar Cells

scholarly journals Correlated In Situ Low-Frequency Noise and Impedance Spectroscopy Reveal Recombination Dynamics in Organic Solar Cells Using Fullerene and Non-Fullerene Acceptors

2017 ◽  
Vol 27 (48) ◽  
pp. 1703805 ◽  
Author(s):  
Kyle A. Luck ◽  
Vinod K. Sangwan ◽  
Patrick E. Hartnett ◽  
Heather N. Arnold ◽  
Michael R. Wasielewski ◽  
...  
Keyword(s):  
Solar Cells ◽  
Impedance Spectroscopy ◽  
Organic Solar Cells ◽  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Recombination Dynamics

scholarly journals A combined transient photovoltage and impedance spectroscopy approach for a comprehensive study of interlayer degradation in non-fullerene acceptor organic solar cells

Nanoscale ◽  
2019 ◽  
Vol 11 (22) ◽  
pp. 10872-10883 ◽  
Author(s):  
Adam Pockett ◽  
Harrison Ka Hin Lee ◽  
Brendan L. Coles ◽  
Wing C. Tsoi ◽  
Matthew J. Carnie
Keyword(s):  
Solar Cells ◽  
Impedance Spectroscopy ◽  
Active Layer ◽  
Organic Solar Cells ◽  
Transient Photovoltage ◽  
Comprehensive Study

Transient photovoltage and impedance spectroscopy measurements reveal how degradation affects both the active layer and the interlayer in OPV devices.

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