Characterization of radiative recombination in amorphous silicon by optically detected magnetic resonance: Part I

Depinna, S. P.; Cavenett, B.C.; Austin, I. G.; Searle, T. M.; Thompson, Malcolm J.; Allison, J.; Comber, P. G. Le

doi:10.1080/01418638208224023

Cited by 37 publications

(21 citation statements)

References 39 publications

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“…The corresponding resonance ('h signal') has been investigated in the past using EDMR [25,28,30] and optically detected magnetic resonance (ODMR) revealing g = 2.011 to 2.013 [31][32][33]. In the solar cells C and D (a-Si:H p-layer) we found a signal at g h = 2.011 which we assign to valence band tail states in a-Si:H. No evidence of boron acceptor states could be found.…”

Section: P-doped A-si:hmentioning

confidence: 99%

Electrical detection of electron spin resonance in microcrystalline silicon pin solar cells

Behrends

Schnegg

Fehr

et al. 2009

Philosophical Magazine

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Section: P-doped A-si:hmentioning

confidence: 99%

Electrical detection of electron spin resonance in microcrystalline silicon pin solar cells

Behrends

Schnegg

Fehr

et al. 2009

Philosophical Magazine

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“…Over the years, optically detected magnetic resonance (ODMR) has proven to be a powerful tool for the study of spindependent recombination and dissociation processes, both in inorganic [1][2][3] and in organic [4] semiconductors. High sensitivity, exceeding the sensitivity of conventional electron spin resonance by about 6 orders of magnitude, renders ODMR the tool of choice when it comes to π -conjugated polymers [4], where the density of spin carriers is small.…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of magnetic resonance in the polaron pair recombination and the triplet exciton-polaron quenching models

et al. 2018

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Mkhitaryan, Vagharsh; Danilovic, Dusan; Hippola, Chamika M.; Raikh, M. E.; and Shinar, Joseph, "Comparative analysis of magnetic resonance in the polaron pair recombination and the triplet exciton-polaron quenching models" (2018). Ames Laboratory Accepted Manuscripts. 92. http://lib.dr.iastate.edu/ameslab_manuscripts/92Comparative analysis of magnetic resonance in the polaron pair recombination and the triplet exciton-polaron quenching models AbstractWe present a comparative theoretical study of magnetic resonance within the polaron pair recombination (PPR) and the triplet exciton-polaron quenching (TPQ) models. Both models have been invoked to interpret the photoluminescence detected magnetic resonance (PLDMR) results in π -conjugated materials and devices. We show that resonance line shapes calculated within the two models differ dramatically in several regards. First, in the PPR model, the line shape exhibits unusual behavior upon increasing the microwave power: it evolves from fully positive at weak power to fully negative at strong power. In contrast, in the TPQ model, the PLDMR is completely positive, showing a monotonic saturation. Second, the two models predict different dependencies of the resonance signal on the photoexcitation power, P L . At low P L , the resonance amplitude Δ I / I is ∝ P L within the PPR model, while it is ∝ P 2 L crossing over to P 3 L within the TPQ model. On the physical level, the differences stem from different underlying spin dynamics. Most prominently, a negative resonance within the PPR model has its origin in the microwave-induced spin-Dicke effect, leading to the resonant quenching of photoluminescence. The spin-Dicke effect results from the spin-selective recombination, leading to a highly correlated precession of the on-resonance pair partners under the strong microwave power. This effect is not relevant for TPQ mechanism, where the strong zero-field splitting renders the majority of triplets off resonance. On the technical level, the analytical evaluation of the line shapes for the two models is enabled by the fact that these shapes can be expressed via the eigenvalues of a complex Hamiltonian. This bypasses the necessity of solving the much larger complex linear system of the stochastic Liouville equations. Our findings pave the way towards a reliable discrimination between the two mechanisms via cw PLDMR. We present a comparative theoretical study of magnetic resonance within the polaron pair recombination (PPR) and the triplet exciton-polaron quenching (TPQ) models. Both models have been invoked to interpret the photoluminescence detected magnetic resonance (PLDMR) results in π -conjugated materials and devices. We show that resonance line shapes calculated within the two models differ dramatically in several regards. First, in the PPR model, the line shape exhibits unusual behavior upon increasing the microwave power: it evolves from fully positive at weak power to fully negative at strong power. In contrast, in the TPQ model, the PLDMR is completely positive, show...

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“…ODMR has been used in a wide range of research areas since its first invention 3,4 . ODMR and EDMR are about 8 to 9 orders more sensitive than ESR, they both are proven to have single spin sensitivity 2,5-8 , and they both can directly link a paramagnetic center to a specific luminescence center [5][6][7]9 . Thanks to these advantages, ODMR can be used to deconvolute unresolved, overlapping luminescence bands in semiconductors 10 .…”

Section: Introductionmentioning

confidence: 99%

“…Thus ESR can alter recombination rate which results in change in photoluminescence and photocurrent, and they can be detected optically and electrically, respectively. variety of defect states which influence recombination in aSi 6,7,10,[13][14][15][16] .…”

Section: Introductionmentioning

confidence: 99%

Modulation frequency dependence of continuous-wave optically/electrically detected magnetic resonance

et al. 2012

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Continuous wave optically and electrically detected magnetic resonance spectroscopy (cwODMR/cwEDMR) allow the investigation of paramagnetic states involved in spin-dependent transitions, like recombination and transport. Although experimentally similar to conventional electron spin resonance (ESR), there exist limitations when applying models originally developed for ESR to observables (luminescence and electric current) of cwODMR and cwEDMR. Here we present closed-form solutions for the modulation frequency dependence of cwODMR and cwEDMR based on an intermediate pair recombination model and discuss ambiguities which arise when attempting to distinguish the dominant spin-dependent processes underlying experimental data. These include: 1) a large number of quantitatively different models cannot be differentiated, 2) signs of signals are determined not only by recombination, but also by other processes like dissociation, intersystem-crossing, pair generation, and even experimental parameter such as, modulation frequency, microwave power, and temperature, 3) radiative and non-radiative recombination cannot be distinguished due to the observed signs of cwODMR and cwEDMR experiments.

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Characterization of radiative recombination in amorphous silicon by optically detected magnetic resonance: Part I

Cited by 37 publications

References 39 publications

Electrical detection of electron spin resonance in microcrystalline silicon pin solar cells

Electrical detection of electron spin resonance in microcrystalline silicon pin solar cells

Comparative analysis of magnetic resonance in the polaron pair recombination and the triplet exciton-polaron quenching models

Modulation frequency dependence of continuous-wave optically/electrically detected magnetic resonance

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