Actinoelectric Effects in Tartaric Acid Crystals

Brady, James J.; Moore, W.H.

doi:10.1103/physrev.55.308

Cited by 9 publications

(9 citation statements)

References 4 publications

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“…One group of materials that break this rule when treated homogeneously are ferroelectric materials. Anomalously high photovoltages (APV) have been reported from ferroelectric Rochelle salt crystal as early as 1939 by Brady and Moore [99]. It has been shown that APV's in the order of 40 V can be obtained from BaTiO 3 [100] under ideal circumstances which far exceed the band gap of 3.2 eV.…”

Section: Ferroelectric Photocurrents and The Anomalously High Photovomentioning

confidence: 99%

Photochemistry on a polarisable semi-conductor: what do we understand today?

2009

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The continued development of ferroelectric materials into more and more consumer led applications has been at the forefront of recent ferroelectric material research. It is, however, possible to view a ferroelectric as a wide band gap semi-conductor that can sustain a surface charge density. This charge density arises from the movement of ions in the crystal lattice and the need to compensate for this charge. When viewing ferroelectrics as polarisable semi-conductors a large number of new interactions are possible. One such is the use of super band gap illumination to generate electron-hole pairs. These photogenerated carriers can then perform local electrochemistry.

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Section: Ferroelectric Photocurrents and The Anomalously High Photovomentioning

confidence: 99%

Photochemistry on a polarisable semi-conductor: what do we understand today?

2009

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“…Таким обра-зом, токи, обусловленные рекомбинацией и возбуждением, направ-лены одинаково и не могут скомпенсировать друг друга в равновесии с черным излучением. Это обстоятельство является, конечно, прямым, следствием (1.3), (1)(2)(3)(4). Для оценки величины тока / р необходимо учесть, что в стационарных условиях скорости возбуждения и рекомбинации частиц одинаковы (κ/Μω), а релаксация образующейся после рекомби-нации асимметрии скоростей частиц происходит вновь за время изотро-пизации Гй 1 .…”

Section: б) модель асимметричных ямunclassified

“…Параметром асимметрии для сегне-тоэлектриков служит £ с = dlea, где d -дипольный момент элементарной ячейки. Для пьезоэлектриков ξ π = Q/ea 3 , где Q -октупольный момент ячейки. Степень гиротропии кристалла характеризует величина ξ Γ = = gXa,- 1 34 , где g -вектор гирации, а λ -длина волны света.…”

Section: фгэ в газахunclassified

“…4) имеют порядок величины, задаваемый атомным масштабом и соот-ветствующим параметром асимметрии. Таким образом, / » d « ^еа -характерный дипольный момент; h iln x Q iln ж ζ η εα 3 -октупольный мо-мент. Константы Ь,ц и у и имеют релятивистскую малость: h u ж ξ π χ X (Ze^lhcf еа 3 ; уц да £,.с (е 2 /Лс) 3 Z 2 « 10 6 см/с -порядка скорости поля-ризованных электронов на границе зоны, Ζ = 25.…”

Section: фгэ в газахunclassified

“…рядом авторов *). Так, в экспериментах 5~7 , выполненных на кри-сталлах сегнетоэлектриков LiNbO 3 , ВаТЮ 3 , наблюдались постоянные фототоки, /φ ~ 10~1 0 А/см 2 , и фотонапряжения, существенно превосходя-щие ширину запрещенной зоны. Эти явления связывались с релаксацией внутренних полей в кристаллах.…”

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New device concepts and new computing principles are needed to balance our ever-growing appetite for data and information with the realization of the goals of increased energy efficiency, reduction in CO 2 emissions and the circular economy. Neuromorphic or synaptic electronics is an emerging field of research aiming to overcome the current computer's Von-Neumann bottleneck by building artificial neuronal systems to mimic the extremely energy efficient biological synapses. The introduction of photovoltaic and/or photonic aspects into these neuromorphic architectures will produce self-powered adaptive electronics but may also open up new possibilities in artificial neuroscience, artificial neural communications, sensing and machine learning which would enable, in turn, a new era for computational systems owing to the possibility of attaining high bandwidths with much reduced power consumption. This perspective is focused on recent progress in the implementation of functional oxide thinfilms into photovoltaic and neuromorphic applications towards the envisioned goal of selfpowered photovoltaic neuromorphic systems or a solar brain.

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Actinoelectric Effects in Tartaric Acid Crystals

Cited by 9 publications

References 4 publications

Photochemistry on a polarisable semi-conductor: what do we understand today?

Photochemistry on a polarisable semi-conductor: what do we understand today?

The photogalvanic effect in media lacking a center of symmetry

Functional Oxides for Photoneuromorphic Engineering: Toward a Solar Brain

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