Eliminating RC-Effects in Transient Photocurrent Measurements on Organic Photodiodes

Kettlitz, Siegfried W.; Mescher, Jan; Christ, Nico; Nintz, Mirco; Valouch, Sebastian; Colsmann, Alexander; Lemmer, Uli

doi:10.1109/lpt.2013.2247036

Cited by 23 publications

(12 citation statements)

References 11 publications

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“…There are several critical considerations that must be taken into account for accurate TPC measurements, including aggressively minimizing circuit series resistance, optimization of sample geometry, accurate control of laser fluence, and careful selection of RF circuit elements that do not attenuate high‐frequency signal components . Despite the relatively simple appearance of the apparatus, preserving pulse fidelity in high‐speed transient analog electronics with a highly capacitive load is one of the most demanding circuit requirements.…”

Section: P‐dts(ptth2)2:pc71bm Solar Cell Figures Of Merit When Procesmentioning

confidence: 99%

Transient Photocurrent Response of Small‐Molecule Bulk Heterojunction Solar Cells

2014

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Section: P‐dts(ptth2)2:pc71bm Solar Cell Figures Of Merit When Procesmentioning

confidence: 99%

Transient Photocurrent Response of Small‐Molecule Bulk Heterojunction Solar Cells

2014

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“…The TPC transients were routinely corrected for RC time effects as described elsewhere. [94] A biased silicon detector (Thorlabs DET36A) was used to monitor the switching dynamics and background light intensity. The latter was preadjusted for each device by matching the current-voltage response under simulated sunlight.…”

Section: Methodsmentioning

confidence: 99%

How to Reduce Charge Recombination in Organic Solar Cells: There are Still Lessons to Learn from P3HT:PCBM

Wilken

Scheunemann

Dahlström

et al. 2021

Adv Elect Materials

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However, despite the wide variety of materials that are now available, there are still only a few systems that maintain their full performance at junction thicknesses of 300 nm and more. [4][5][6] Compatibility with thick active layers, as well as a general tolerance to thickness variations, is considered an important prerequisite for the low-cost production of OPVs using printing techniques. [7,8] The main problem with increasing thickness is the slowdown of charge collection, which makes photogenerated carriers more vulnerable to recombination. [9][10][11] This is particularly true for NFA-based systems, which typically have low carrier mobilities of 10 −9 to 10 −8 m 2 V −1 s −1

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“…The full‐width‐half‐maximum time ( t FWHM ) and the decay time from 90% to 10% ( t 90%–10% ) of a current pulse response can be used to characterize the dynamic behavior of the device. The ITO‐free device shows longer t FWHM and t 90%–10% compared to Device B (see Table 3 ), which can be partly attributed to the higher series resistance of the printed bottom PEDOT:PSS layer compared to the ITO cathode . The fast Fourier transformation (FFT) of the pulse response yields the normalized response in dB, where the bandwidth (BW) can be approximated at the −3 dB cut‐off frequency, which represents a decay to 50% of the maximum power, as shown in Figure c,d.…”

Section: Optoelectronic Performance Of Ito‐containing Opds At ‐3 V Rementioning

confidence: 98%

Aerosol‐Jet Printed Flexible Organic Photodiodes: Semi‐Transparent, Color Neutral, and Highly Efficient

Eckstein

Rödlmeier

Glaser

et al. 2015

Adv Elect Materials

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which makes AJP therefore a suitable candidate for all of the above-mentioned applications.In this work, we present fl exible OPDs fully printed by AJP with equivalent performance to state-of-the-art devices fabricated on rigid substrates by conventional deposition methods. The OPDs exhibit a device transparency of ≈15% while reaching external quantum effi ciency (EQE) values of up to 50%, a high spectral response (SR) (≥0.26 A W −1 ), a specifi c detectivity ( D *) >10 11 Jones from top and bottom illumination, respectively, as well as a bandwidth up to ≈300 kHz at −3 V reverse bias. Furthermore, the devices are exceptionally color neutral and thus very well suited for see through or building-integrated applications.Figure 1 a presents a scheme of the device architectures and energy band diagrams of the two types of printed OPDs fabricated in the so-called inverted confi guration (with the n -contact as the bottom electrode). In this work, two types of OPDs were fabricated. First, OPDs have been deposited via AJP on the top of an ITO covered PET foil (see Figure 1 a(i)). Second, the ITO was replaced by a conductive PEDOT:PSS electrode. The ITOfree device architecture can be seen in Figure 1 a(ii). Aside from the bottom electrode, all devices comprised the same layer stack. In both device confi gurations, a layer of aluminum doped zinc oxide (AZO) nanoparticles was used as the hole-blocking layer for the cathode. The n -doped AZO offers three orders of magnitude higher electrical conductivity compared to intrinsic ZnO, which allows for deposition of thicker layers. [ 11 ] The active layer and the complementary anode consisted of a blended polythieno[3,4b ]-thiopheneco -benzodithiophene (PTB7) and [6,6]-phenyl C71-butyric acid methyl ester (PC70BM) bulk heterojunction and conductive PEDOT:PSS, respectively. Figure 1 b shows photographs of an ITO-free sample containing four fully printed semitransparent OPD pixels fabricated with different active layer thicknesses. The top panel of Figure 1 b exemplifi es the mechanical fl exibility of the OPDs fabricated on fl exible PET substrates, as well as the feasibility to produce a series of devices using the process presented in this work.Printing parameters such as printing speed, material fl ow, and sheath gas fl ow rates were optimized in order to obtain smooth and homogeneous layers suitable for device fabrication. With the optimized printing parameters, the surface modulation, resulting from the sequential printing path, as well as coffee stain effects at the edge of the printed areas were drastically reduced. A detailed explanation of the optimization of the layer deposition is shown in the fi rst section of the Supporting Information ( Figure S1 and Table S1), while the working principle of the AJP can be found elsewhere. [ 12 ] In order to confi rm that the chemical structure of the active materials was Optical sensors have become the focus of great industrial and academic research interest due to their applications in environmental monitoring, [ 1 ] the automotive...

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Eliminating RC-Effects in Transient Photocurrent Measurements on Organic Photodiodes

Cited by 23 publications

References 11 publications

Transient Photocurrent Response of Small‐Molecule Bulk Heterojunction Solar Cells

Transient Photocurrent Response of Small‐Molecule Bulk Heterojunction Solar Cells

How to Reduce Charge Recombination in Organic Solar Cells: There are Still Lessons to Learn from P3HT:PCBM

Aerosol‐Jet Printed Flexible Organic Photodiodes: Semi‐Transparent, Color Neutral, and Highly Efficient

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