Improving Performance of Perovskite Solar Cells Using [7]Helicenes with Stable Partial Biradical Characters as the Hole-Extraction Layers

Chia Chen Lee, Chih I. Chen, Chia Te Fang, Pei Yu Huang, Yao-Ting Wu, Chu Chen Chueh

研究成果: Article

1 引文 (Scopus)

摘要

Organic–inorganic hybrid perovskites have realized a high power conversion efficiency (PCE) in both n–i–p and p–i–n device configurations. However, since the p–i–n structure exempts the sophisticated processing of charge-transporting layers, it seems to possess better potential for practical applications than the n–i–p one. Currently, the inorganic NiO x is the most prevailing hole-transporting layer (HTL) used in p–i–n perovskite solar cells. Nevertheless, defects might exist on its surface to influence the charge transfer/extraction across the interface with perovskite and to affect the quality of the perovskite film grown on it. Herein, two novel [7]helicenes with stable open-shell singlet biradical ground states at room temperature are demonstrated as an effective surface modifier of the NiO x HTL. Their nonpolar feature effectively promotes the crystallinity of the perovskite film grown on them; meanwhile, their unique partial biradical character seems to provide a certain degree of defect passivation function at the perovskite interface to facilitate interfacial charge transfer/extraction. As a result, both 1ab- and 1bb-modifed devices yield a PCE of >18%, exceeding the value (15.6%) of the control device using a sole NiO x HTL, and the maximum PCE can reach 19%. Detailed characterizations are carefully conducted to understand the underlying reasons behind such enhancement.

原文English
文章編號1808625
期刊Advanced Functional Materials
29
發行號13
DOIs
出版狀態Published - 2019 三月 28

指紋

Perovskite
solar cells
Conversion efficiency
Charge transfer
charge transfer
Defects
control equipment
defects
perovskites
Passivation
Ground state
passivity
crystallinity
ground state
Perovskite solar cells
helicenes
perovskite
augmentation
room temperature
Processing

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Electrochemistry

引用此文

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abstract = "Organic–inorganic hybrid perovskites have realized a high power conversion efficiency (PCE) in both n–i–p and p–i–n device configurations. However, since the p–i–n structure exempts the sophisticated processing of charge-transporting layers, it seems to possess better potential for practical applications than the n–i–p one. Currently, the inorganic NiO x is the most prevailing hole-transporting layer (HTL) used in p–i–n perovskite solar cells. Nevertheless, defects might exist on its surface to influence the charge transfer/extraction across the interface with perovskite and to affect the quality of the perovskite film grown on it. Herein, two novel [7]helicenes with stable open-shell singlet biradical ground states at room temperature are demonstrated as an effective surface modifier of the NiO x HTL. Their nonpolar feature effectively promotes the crystallinity of the perovskite film grown on them; meanwhile, their unique partial biradical character seems to provide a certain degree of defect passivation function at the perovskite interface to facilitate interfacial charge transfer/extraction. As a result, both 1ab- and 1bb-modifed devices yield a PCE of >18{\%}, exceeding the value (15.6{\%}) of the control device using a sole NiO x HTL, and the maximum PCE can reach 19{\%}. Detailed characterizations are carefully conducted to understand the underlying reasons behind such enhancement.",
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Improving Performance of Perovskite Solar Cells Using [7]Helicenes with Stable Partial Biradical Characters as the Hole-Extraction Layers. / Lee, Chia Chen; Chen, Chih I.; Fang, Chia Te; Huang, Pei Yu; Wu, Yao-Ting; Chueh, Chu Chen.

於: Advanced Functional Materials, 卷 29, 編號 13, 1808625, 28.03.2019.

研究成果: Article

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T1 - Improving Performance of Perovskite Solar Cells Using [7]Helicenes with Stable Partial Biradical Characters as the Hole-Extraction Layers

AU - Lee, Chia Chen

AU - Chen, Chih I.

AU - Fang, Chia Te

AU - Huang, Pei Yu

AU - Wu, Yao-Ting

AU - Chueh, Chu Chen

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Y1 - 2019/3/28

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AB - Organic–inorganic hybrid perovskites have realized a high power conversion efficiency (PCE) in both n–i–p and p–i–n device configurations. However, since the p–i–n structure exempts the sophisticated processing of charge-transporting layers, it seems to possess better potential for practical applications than the n–i–p one. Currently, the inorganic NiO x is the most prevailing hole-transporting layer (HTL) used in p–i–n perovskite solar cells. Nevertheless, defects might exist on its surface to influence the charge transfer/extraction across the interface with perovskite and to affect the quality of the perovskite film grown on it. Herein, two novel [7]helicenes with stable open-shell singlet biradical ground states at room temperature are demonstrated as an effective surface modifier of the NiO x HTL. Their nonpolar feature effectively promotes the crystallinity of the perovskite film grown on them; meanwhile, their unique partial biradical character seems to provide a certain degree of defect passivation function at the perovskite interface to facilitate interfacial charge transfer/extraction. As a result, both 1ab- and 1bb-modifed devices yield a PCE of >18%, exceeding the value (15.6%) of the control device using a sole NiO x HTL, and the maximum PCE can reach 19%. Detailed characterizations are carefully conducted to understand the underlying reasons behind such enhancement.

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