Simultaneous performance and stability improvement of polymer:fullerene solar cells by doping with piperazine

High efficiency and performance stability are the two key challenges for polymer solar cells before their commercialization. With the development of high-performance conjugated polymer donors and small-molecule acceptors, the power conversion efficiency (PCE) of polymer solar cells now reaches 17%....

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Veröffentlicht in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2019, Vol.7 (12), p.7099-7108
Hauptverfasser: Yan, Lingpeng, Wang, Yaling, Wei, Junfeng, Ji, Guoqi, Gu, Huimin, Li, Zerui, Zhang, Jianqi, Luo, Qun, Wang, Zhongqiang, Liu, Xuguang, Xu, Bingshe, Wei, Zhixiang, Ma, Chang-Qi
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container_issue 12
container_start_page 7099
container_title Journal of materials chemistry. A, Materials for energy and sustainability
container_volume 7
creator Yan, Lingpeng
Wang, Yaling
Wei, Junfeng
Ji, Guoqi
Gu, Huimin
Li, Zerui
Zhang, Jianqi
Luo, Qun
Wang, Zhongqiang
Liu, Xuguang
Xu, Bingshe
Wei, Zhixiang
Ma, Chang-Qi
description High efficiency and performance stability are the two key challenges for polymer solar cells before their commercialization. With the development of high-performance conjugated polymer donors and small-molecule acceptors, the power conversion efficiency (PCE) of polymer solar cells now reaches 17%. A method that can improve the PCE while keeping the high device stability of polymer solar cells is therefore strongly needed. In this paper, we report the use of piperazine as a molecular dopant in the blends of the well-investigated polymer–fullerene solar cell systems, including P3HT:PC 61 BM, PTB7-Th:PC 61 BM and PffBT4T-2OD:PC 61 BM. The results indicate that both the efficiency and stability of these polymer solar cells are improved simultaneously after such a molecular doping process. The electron mobility of the piperazine-doped P3HT:PC 61 BM film (1.68 × 10 −3 cm 2 V −1 s −1 ) was found to be enhanced by almost 10 times in comparison with that of the pristine P3HT:PC 61 BM film (2.0 × 10 −4 cm 2 V −1 s −1 ) by measuring the injection-charge extraction by linearly increasing voltage (i-CELIV) in a metal-insulator-semiconductor (MIS) diode, which is due to the intermolecular electron transfer between piperazine and PC 61 BM, as confirmed by the dark electron spin resonance (ESR) measurement. In addition, piperazine molecules are able to reduce oxidized P3HT, yielding neutral P3HT, which is considered as the second reason for the performance enhancement. Photon-induced charge transfer between PC 61 BM and piperazine was confirmed by light electron spin resonance (LESR) measurements. Such a charge transfer process leads to the quenching of PC 61 BM excitons by piperazine, which decreases the PC 61 BM dimerization rate and consequently suppresses the “burn-in” degradation of polymer solar cells. The current work provides an effective method that can simultaneously improve the efficiency and stability of polymer–fullerene solar cells.
doi_str_mv 10.1039/C8TA12109E
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With the development of high-performance conjugated polymer donors and small-molecule acceptors, the power conversion efficiency (PCE) of polymer solar cells now reaches 17%. A method that can improve the PCE while keeping the high device stability of polymer solar cells is therefore strongly needed. In this paper, we report the use of piperazine as a molecular dopant in the blends of the well-investigated polymer–fullerene solar cell systems, including P3HT:PC 61 BM, PTB7-Th:PC 61 BM and PffBT4T-2OD:PC 61 BM. The results indicate that both the efficiency and stability of these polymer solar cells are improved simultaneously after such a molecular doping process. The electron mobility of the piperazine-doped P3HT:PC 61 BM film (1.68 × 10 −3 cm 2 V −1 s −1 ) was found to be enhanced by almost 10 times in comparison with that of the pristine P3HT:PC 61 BM film (2.0 × 10 −4 cm 2 V −1 s −1 ) by measuring the injection-charge extraction by linearly increasing voltage (i-CELIV) in a metal-insulator-semiconductor (MIS) diode, which is due to the intermolecular electron transfer between piperazine and PC 61 BM, as confirmed by the dark electron spin resonance (ESR) measurement. In addition, piperazine molecules are able to reduce oxidized P3HT, yielding neutral P3HT, which is considered as the second reason for the performance enhancement. Photon-induced charge transfer between PC 61 BM and piperazine was confirmed by light electron spin resonance (LESR) measurements. Such a charge transfer process leads to the quenching of PC 61 BM excitons by piperazine, which decreases the PC 61 BM dimerization rate and consequently suppresses the “burn-in” degradation of polymer solar cells. 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A, Materials for energy and sustainability</title><description>High efficiency and performance stability are the two key challenges for polymer solar cells before their commercialization. With the development of high-performance conjugated polymer donors and small-molecule acceptors, the power conversion efficiency (PCE) of polymer solar cells now reaches 17%. A method that can improve the PCE while keeping the high device stability of polymer solar cells is therefore strongly needed. In this paper, we report the use of piperazine as a molecular dopant in the blends of the well-investigated polymer–fullerene solar cell systems, including P3HT:PC 61 BM, PTB7-Th:PC 61 BM and PffBT4T-2OD:PC 61 BM. The results indicate that both the efficiency and stability of these polymer solar cells are improved simultaneously after such a molecular doping process. The electron mobility of the piperazine-doped P3HT:PC 61 BM film (1.68 × 10 −3 cm 2 V −1 s −1 ) was found to be enhanced by almost 10 times in comparison with that of the pristine P3HT:PC 61 BM film (2.0 × 10 −4 cm 2 V −1 s −1 ) by measuring the injection-charge extraction by linearly increasing voltage (i-CELIV) in a metal-insulator-semiconductor (MIS) diode, which is due to the intermolecular electron transfer between piperazine and PC 61 BM, as confirmed by the dark electron spin resonance (ESR) measurement. In addition, piperazine molecules are able to reduce oxidized P3HT, yielding neutral P3HT, which is considered as the second reason for the performance enhancement. Photon-induced charge transfer between PC 61 BM and piperazine was confirmed by light electron spin resonance (LESR) measurements. Such a charge transfer process leads to the quenching of PC 61 BM excitons by piperazine, which decreases the PC 61 BM dimerization rate and consequently suppresses the “burn-in” degradation of polymer solar cells. 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A, Materials for energy and sustainability</jtitle><date>2019</date><risdate>2019</risdate><volume>7</volume><issue>12</issue><spage>7099</spage><epage>7108</epage><pages>7099-7108</pages><issn>2050-7488</issn><eissn>2050-7496</eissn><abstract>High efficiency and performance stability are the two key challenges for polymer solar cells before their commercialization. With the development of high-performance conjugated polymer donors and small-molecule acceptors, the power conversion efficiency (PCE) of polymer solar cells now reaches 17%. A method that can improve the PCE while keeping the high device stability of polymer solar cells is therefore strongly needed. In this paper, we report the use of piperazine as a molecular dopant in the blends of the well-investigated polymer–fullerene solar cell systems, including P3HT:PC 61 BM, PTB7-Th:PC 61 BM and PffBT4T-2OD:PC 61 BM. The results indicate that both the efficiency and stability of these polymer solar cells are improved simultaneously after such a molecular doping process. The electron mobility of the piperazine-doped P3HT:PC 61 BM film (1.68 × 10 −3 cm 2 V −1 s −1 ) was found to be enhanced by almost 10 times in comparison with that of the pristine P3HT:PC 61 BM film (2.0 × 10 −4 cm 2 V −1 s −1 ) by measuring the injection-charge extraction by linearly increasing voltage (i-CELIV) in a metal-insulator-semiconductor (MIS) diode, which is due to the intermolecular electron transfer between piperazine and PC 61 BM, as confirmed by the dark electron spin resonance (ESR) measurement. In addition, piperazine molecules are able to reduce oxidized P3HT, yielding neutral P3HT, which is considered as the second reason for the performance enhancement. Photon-induced charge transfer between PC 61 BM and piperazine was confirmed by light electron spin resonance (LESR) measurements. Such a charge transfer process leads to the quenching of PC 61 BM excitons by piperazine, which decreases the PC 61 BM dimerization rate and consequently suppresses the “burn-in” degradation of polymer solar cells. The current work provides an effective method that can simultaneously improve the efficiency and stability of polymer–fullerene solar cells.</abstract><cop>Cambridge</cop><pub>Royal Society of Chemistry</pub><doi>10.1039/C8TA12109E</doi><tpages>10</tpages><orcidid>https://orcid.org/0000-0002-3295-3813</orcidid><orcidid>https://orcid.org/0000-0002-3549-1482</orcidid><orcidid>https://orcid.org/0000-0002-9293-5027</orcidid><orcidid>https://orcid.org/0000-0001-6188-3634</orcidid><orcidid>https://orcid.org/0000-0002-7527-460X</orcidid></addata></record>
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source Royal Society Of Chemistry Journals 2008-
subjects Burn-in
Charge injection
Charge transfer
Commercialization
Dimerization
Donors (electronic)
Doping
Efficiency
Electron mobility
Electron paramagnetic resonance
Electron spin
Electron transfer
Energy conversion efficiency
Fullerenes
Insulators
MIS (semiconductors)
Performance enhancement
Photovoltaic cells
Piperazine
Polymer blends
Polymers
Resonance
Solar cells
Solar power
Spin resonance
Stability
title Simultaneous performance and stability improvement of polymer:fullerene solar cells by doping with piperazine
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