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Trapping effects on the mobility of anthracene crystals

Влияние ловушек на подвижность в кристаллах антрацена

  • Published:
Il Nuovo Cimento B (1971-1996)

Summary

The experimental photocurrent transients in anthracene crystals of duration less than the microscopic transit timeT 0 are studied. The transients are analysed in relation to the movement of the excess free carriers which, as they migrate towards the collecting electrode, are subject to trapping and detrapping phenomena by monoenergetic levels. The theoretical signals, which depend not only on the microscopic transit time but also on the trapping parametersτ in andτ d, are in good agreement with the experimental results. Analysis of the transients reveals the presence of at least two monoenergetic hole-trapping levels with activation energies ofE 1=0.26 eV andE 2=0.40 eV, respectively.

Riassunto

Si effettua lo studio dei segnali sperimentali di fotocorrente in cristalli di antracene di durata inferiore al tempo di transito microscopicoT 0. I transitori sono stati studiati con riferimento al moto dei portatori liberi in eccesso che, muovendosi verso l’elettrodo di raccolta, sono soggetti a fenomeni di intrappolamento e strappolamento da parte di livelli monoenergetici. I segnali teorici dipendenti, oltre che dal tempo di transito microscopico, dai parametri di trappolaτ in eτ d, si accordano molto bene con i risultati sperimentali. L’analisi dei transitori rivela la presenza di almeno due livelli di intrappolamento monoenergetici per buchi con energia di attivazione rispettivamenteE 1=0.26 eV edE 2=0.40 eV.

Резюме

Исследуются экспериментальные фототоковые переходные процессы в кристаллах антрацена для времен меньших, чем время микроскопического переходаT 0. Переходные процессы анализируются в связи с движением избыточных свободных носителей, которые при миграции по направлению к собирающему электроду подвергаются явлениям захвата и освобождения со стороны моноэнергетических уровней ловушек. Теоретические ситналы, которые зависят не только от микроскопического времени перехода, но и от параметров ловушекτ in иτ d, хорошо согласуются с экспериментальными результатами. Анализ переходов указывает на наличие, по крайней мере, двух моноэнергетических уровней дырочных ловушек с энергиями активации соответственноE 1=0.26 эВ иE 2=0.40 эВ.

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Authors and Affiliations

  1. Istituto di Fisica dell’Università, Modena, Italia

    T. Corazzari & T. Garofano

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  1. T. Corazzari
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Corazzari, T., Garofano, T. Trapping effects on the mobility of anthracene crystals. Nuov Cim B 33, 719–731 (1976). https://doi.org/10.1007/BF02723900

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