Electroluminescence from charge transfer states in Donor/Acceptor solar cells

Golenaz Sherafatipour; Morten Madsen

Electroluminescence from charge transfer states in Donor/Acceptor solar cells

Golenaz Sherafatipour, Morten Madsen

Research output: Contribution to conference without publisher/journal › Poster › Research › peer-review

Abstract

Charge photocurrent generation is a key process in solar energy conversion systems. Effective dissociation of the photo-generated electron-hole pairs (excitons) has a strong influence on the efficiency of the organic solar cells. Charge dissociation takes place at the donor/acceptor interface via charge transfer (CT) excitons, which is Coulombically bound interfacial electron- hole pairs residing at the donor/acceptor heterojunctions. The CT state represents an intermediate state between the exciton dissociation and recombination back to the ground state. Since the recombination of photo-generated charges is a major limitation for the efficiency of the organic solar cells, a thorough understanding of this loss mechanism is crucial to improve the performance of the devices. Furthermore, examining this interfacial state is of great importance in order to maximize open-circuit voltage and photocurrent simultaneously as they both depend on it[1]. As a useful method, Electroluminescence (EL) measurements can be applied to examine CT-state emission. In this method[2], CT states are created by injection of electrons and holes into the device, and the luminescence originated from free carrier recombination at the donor/acceptor interface is detected. As a less studied system, we examine here the interfacial charge transfer state recombination in DBP:C70 thin-films. The weak EL from the small molecule solar cell biased in the forward direction gives valuable information about the CT state recombination, from which the maximum open-circuit voltage can be estimated, and further can be used in the modeling and optimization of the OPV devices.

[1] C. Deibe, T. Strobe, and V. Dyakonov, “Role of the charge transfer state in organic donor-acceptor solar cells,” Adv. Mater., vol. 22, pp. 4097–4111, 2010.
[2] K. Tvingstedt, K. Vandewal, A. Gadisa, F. Zhang, J. Manca, and O. Inganäs, “Electroluminescence from charge transfer states in polymer solar cells,” J. Am. Chem. Soc., vol. 131, no. 3, pp. 11819–11824, 2009.

Original language	English
Publication date	18. Sept 2015
Publication status	Published - 18. Sept 2015
Event	7th School on Organic Electronics: Summer School on Organic Electronics From Semiconductor to Biomolecular Interfaces - Lake Como School of Advanced Studies, Como, Italy Duration: 14. Sept 2015 → 18. Sept 2015 http://oeri.lakecomoschool.org/

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Other	7th School on Organic Electronics
Location	Lake Como School of Advanced Studies
Country/Territory	Italy
City	Como
Period	14/09/2015 → 18/09/2015
Internet address	http://oeri.lakecomoschool.org/

Cite this

@conference{f60dd18eb09c41e3b1ce0b403bf7e39c,

title = "Electroluminescence from charge transfer states in Donor/Acceptor solar cells",

abstract = "Charge photocurrent generation is a key process in solar energy conversion systems. Effective dissociation of the photo-generated electron-hole pairs (excitons) has a strong influence on the efficiency of the organic solar cells. Charge dissociation takes place at the donor/acceptor interface via charge transfer (CT) excitons, which is Coulombically bound interfacial electron- hole pairs residing at the donor/acceptor heterojunctions. The CT state represents an intermediate state between the exciton dissociation and recombination back to the ground state. Since the recombination of photo-generated charges is a major limitation for the efficiency of the organic solar cells, a thorough understanding of this loss mechanism is crucial to improve the performance of the devices. Furthermore, examining this interfacial state is of great importance in order to maximize open-circuit voltage and photocurrent simultaneously as they both depend on it[1]. As a useful method, Electroluminescence (EL) measurements can be applied to examine CT-state emission. In this method[2], CT states are created by injection of electrons and holes into the device, and the luminescence originated from free carrier recombination at the donor/acceptor interface is detected. As a less studied system, we examine here the interfacial charge transfer state recombination in DBP:C70 thin-films. The weak EL from the small molecule solar cell biased in the forward direction gives valuable information about the CT state recombination, from which the maximum open-circuit voltage can be estimated, and further can be used in the modeling and optimization of the OPV devices.[1] C. Deibe, T. Strobe, and V. Dyakonov, “Role of the charge transfer state in organic donor-acceptor solar cells,” Adv. Mater., vol. 22, pp. 4097–4111, 2010.[2] K. Tvingstedt, K. Vandewal, A. Gadisa, F. Zhang, J. Manca, and O. Ingan{\"a}s, “Electroluminescence from charge transfer states in polymer solar cells,” J. Am. Chem. Soc., vol. 131, no. 3, pp. 11819–11824, 2009.",

author = "Golenaz Sherafatipour and Morten Madsen",

year = "2015",

month = sep,

day = "18",

language = "English",

note = "7th School on Organic Electronics : Summer School on Organic Electronics From Semiconductor to Biomolecular Interfaces ; Conference date: 14-09-2015 Through 18-09-2015",

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TY - CONF

T1 - Electroluminescence from charge transfer states in Donor/Acceptor solar cells

AU - Sherafatipour, Golenaz

AU - Madsen, Morten

PY - 2015/9/18

Y1 - 2015/9/18

N2 - Charge photocurrent generation is a key process in solar energy conversion systems. Effective dissociation of the photo-generated electron-hole pairs (excitons) has a strong influence on the efficiency of the organic solar cells. Charge dissociation takes place at the donor/acceptor interface via charge transfer (CT) excitons, which is Coulombically bound interfacial electron- hole pairs residing at the donor/acceptor heterojunctions. The CT state represents an intermediate state between the exciton dissociation and recombination back to the ground state. Since the recombination of photo-generated charges is a major limitation for the efficiency of the organic solar cells, a thorough understanding of this loss mechanism is crucial to improve the performance of the devices. Furthermore, examining this interfacial state is of great importance in order to maximize open-circuit voltage and photocurrent simultaneously as they both depend on it[1]. As a useful method, Electroluminescence (EL) measurements can be applied to examine CT-state emission. In this method[2], CT states are created by injection of electrons and holes into the device, and the luminescence originated from free carrier recombination at the donor/acceptor interface is detected. As a less studied system, we examine here the interfacial charge transfer state recombination in DBP:C70 thin-films. The weak EL from the small molecule solar cell biased in the forward direction gives valuable information about the CT state recombination, from which the maximum open-circuit voltage can be estimated, and further can be used in the modeling and optimization of the OPV devices.[1] C. Deibe, T. Strobe, and V. Dyakonov, “Role of the charge transfer state in organic donor-acceptor solar cells,” Adv. Mater., vol. 22, pp. 4097–4111, 2010.[2] K. Tvingstedt, K. Vandewal, A. Gadisa, F. Zhang, J. Manca, and O. Inganäs, “Electroluminescence from charge transfer states in polymer solar cells,” J. Am. Chem. Soc., vol. 131, no. 3, pp. 11819–11824, 2009.

AB - Charge photocurrent generation is a key process in solar energy conversion systems. Effective dissociation of the photo-generated electron-hole pairs (excitons) has a strong influence on the efficiency of the organic solar cells. Charge dissociation takes place at the donor/acceptor interface via charge transfer (CT) excitons, which is Coulombically bound interfacial electron- hole pairs residing at the donor/acceptor heterojunctions. The CT state represents an intermediate state between the exciton dissociation and recombination back to the ground state. Since the recombination of photo-generated charges is a major limitation for the efficiency of the organic solar cells, a thorough understanding of this loss mechanism is crucial to improve the performance of the devices. Furthermore, examining this interfacial state is of great importance in order to maximize open-circuit voltage and photocurrent simultaneously as they both depend on it[1]. As a useful method, Electroluminescence (EL) measurements can be applied to examine CT-state emission. In this method[2], CT states are created by injection of electrons and holes into the device, and the luminescence originated from free carrier recombination at the donor/acceptor interface is detected. As a less studied system, we examine here the interfacial charge transfer state recombination in DBP:C70 thin-films. The weak EL from the small molecule solar cell biased in the forward direction gives valuable information about the CT state recombination, from which the maximum open-circuit voltage can be estimated, and further can be used in the modeling and optimization of the OPV devices.[1] C. Deibe, T. Strobe, and V. Dyakonov, “Role of the charge transfer state in organic donor-acceptor solar cells,” Adv. Mater., vol. 22, pp. 4097–4111, 2010.[2] K. Tvingstedt, K. Vandewal, A. Gadisa, F. Zhang, J. Manca, and O. Inganäs, “Electroluminescence from charge transfer states in polymer solar cells,” J. Am. Chem. Soc., vol. 131, no. 3, pp. 11819–11824, 2009.

M3 - Poster

T2 - 7th School on Organic Electronics

Y2 - 14 September 2015 through 18 September 2015

ER -

Electroluminescence from charge transfer states in Donor/Acceptor solar cells

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