A simple diode model including conductivity modulation

Barna, Á.; Horelick, D.

doi:10.1109/tct.1971.1083246

Cited by 24 publications

(15 citation statements)

References 6 publications

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“…25 ), but a response of the collection efficiency of photogenerated charges to modified electric fields in the device 26,27 , the high low- f capacitance (be it positive or negative) does not describe any process related to charge accumulation and cannot, therefore, be used to extract information on accumulated charges. Instead, it is the result of a modification of current, which can be referred to as conductivity modulation 6 . Our interpretation of a non-relation to accumulated charge is consistent with reports from other fields such as quantum-well infrared photodetectors 28 .…”

Section: Resultsmentioning

confidence: 99%

“…Such a situation can (theoretically) occur when an increased potential leads to a depopulation of interfacial states 3 or under particular circumstances regarding time-dependent trap-assisted recombination in organic semiconductors 4 . The fact that negative capacitance is commonly observed for diodes under forward bias 5 leads to conductivity modulations as a plausible explanation 6,7 . Such modulations can originate from self-heating, as reported for organic single-carrier devices 8 and solar cells 9 .…”

Section: Introductionmentioning

confidence: 98%

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Origin of apparent light-enhanced and negative capacitance in perovskite solar cells

et al. 2019

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So-called negative capacitance seems to remain an obscure feature in the analysis of the frequency-dependent impedance of perovskite solar cells. It belongs to one of the puzzling peculiarities arising from the mixed ionic-electronic conductivity of this class of semiconductor. Here we show that apparently high capacitances in general (positive and negative) are not related to any capacitive feature in the sense of a corresponding charge accumulation. Instead, they are a natural consequence of slow transients mainly in forward current of the diode upon ion displacement when changing voltage. The transient current leads to a positive or negative ‘capacitance’ dependent on the sign of its gradient. The ‘capacitance’ appears so large because the associated resistance, when thinking of a resistor-capacitor element, results from another physical process, namely modified electronic charge injection and transport. Observable for a variety of devices, it is a rather universal phenomenon related to the hysteresis in the current–voltage curve.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Origin of apparent light-enhanced and negative capacitance in perovskite solar cells

et al. 2019

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“…3 as a function of voltage for three illumination intensities (0, 0.1, and 1 sun, Nyquist plots in Supplementary Figs. [6][7][8]. First focusing on the device without negative capacitance ( Fig.…”

Section: Resultsmentioning

confidence: 99%

Origin of apparent light-enhanced and negative capacitance in perovskite solar cells

Ebadi

Taghavinia

Mohammadpour

et al. 2019

Proceedings of the nanoGe Fall Meeting 2019

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So-called negative capacitance seems to remain an obscure feature in the analysis of the frequency-dependent impedance of perovskite solar cells. It belongs to one of the puzzling peculiarities arising from the mixed ionic-electronic conductivity of this class of semiconductor. Here we show that apparently high capacitances in general (positive and negative) are not related to any capacitive feature in the sense of a corresponding charge accumulation. Instead, they are a natural consequence of slow transients mainly in forward current of the diode upon ion displacement when changing voltage. The transient current leads to a positive or negative 'capacitance' dependent on the sign of its gradient. The 'capacitance' appears so large because the associated resistance, when thinking of a resistorcapacitor element, results from another physical process, namely modified electronic charge injection and transport. Observable for a variety of devices, it is a rather universal phenomenon related to the hysteresis in the current-voltage curve.

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“…This hypothesis of a dynamic bulk resistivity is rarely supported in the academic literatures because it is rarely needed. One research implicitly [14] supports this hypothesis by reporting a phenomenon named conductivity modulation. In conductivity modulation, the resistivity or conductivity of the bulk is said to get changed or modulated as a function of the diode current.…”

Section: Adjusting the Shape Of Curvesmentioning

confidence: 96%

A Behavioral DC Model of 3D Distributed Diodes in Presence of Wideband Microwaves on Active Substrate Boards

Chakravorty¹

2020

Preprint

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In the past few years, a new type of circuit board, named here as active substrate board (ASB), was introduced over circuit applications of diodes. Unlike a traditional printed circuit board (PCB), an ASB has its substrate made of a semiconductor. The inability of the traditional integrated circuit (IC) technology to integrate wavelength dependent radio frequency (RF) components triggered the advent of ASBs. These boards draw desirable features from IC as well as PCB technologies. Unprecedented challenges came up in modeling the different devices fabricated on an ASB owing to their large sizes and the presence of wideband microwaves. So far, modeling the effect of large sizes and ambient microwaves on DC bias of diodes have not been considered in scientific literature. Furthermore, the state of the art numerical simulators are unable to imitate the behavior of such diodes observed over measurements. Here, a semi-analytical, behavioral DC model of three dimensional (3D), distributed diodes on ASB is presented that is fairly accurate in predicting the actual behavior of the diodes. The model also opines a novel phenomenon of an AC affecting a DC with an added resistance.

show abstract

A simple diode model including conductivity modulation

Cited by 24 publications

References 6 publications

Origin of apparent light-enhanced and negative capacitance in perovskite solar cells

Origin of apparent light-enhanced and negative capacitance in perovskite solar cells

Origin of apparent light-enhanced and negative capacitance in perovskite solar cells

A Behavioral DC Model of 3D Distributed Diodes in Presence of Wideband Microwaves on Active Substrate Boards

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