Stable Efficiency Exceeding 20.6% for Inverted Perovskite Solar Cells through Polymer-Optimized PCBM Electron-Transport Layers

Dong Yang, Xiaorong Zhang, Kai Wang, Congcong Wu, Ruixia Yang, Yuchen Hou, Yuanyuan Jiang, Shengzhong Liu, Shashank Priya

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Fullerene derivative, such as [6,6]-phenyl C61 butyric acid methyl ester (PCBM), is widely used as an electron-transport layer (ETL) in inverted perovskite solar cell (PSC). However, its low electron mobility, complexity in achieving quality film formation, and severe nonradiative recombination at perovskite/PCBM interface due to the large electron capture region, lead to lower efficiency for inverted PSCs compared to the normal structures. Herein, we demonstrate an effective and practical strategy to overcome these challenges. Conjugated n-type polymeric materials are mixed together with PCBM to form a homogeneous bulk-mixed (HBM) continuous film with high electron mobility and suitable energy level. HBM film is found to completely cap the perovskite surface to enhance the electron extraction. The critical electron capture radius of the HBM decreases to 12.52 nm from 14.89 nm of PCBM due to the large relative permittivity, resulting in reduced nonradiative recombination at perovskite/HBM interface. The efficiency of inverted PSCs with HBM ETLs exceeds 20.6% with a high fill factor of 0.82. Further, the stability of devices is improved owing to the high hydrophobicity of the HBM ETLs. Under ambient air condition after 45 days, the efficiency of inverted PSCs based on HBM remains 80% of the initial value. This is significantly higher than the control devices which retain only 48% of the initial value under similar aging conditions. We believe these breakthroughs in improving efficiency and stability of inverted PSCs will expedite their transition.

Original languageEnglish (US)
Pages (from-to)3313-3320
Number of pages8
JournalNano letters
Volume19
Issue number5
DOIs
StatePublished - May 8 2019

Fingerprint

Butyric acid
Butyric Acid
butyric acid
esters
Esters
Polymers
solar cells
Perovskite
Electron mobility
polymers
electron mobility
electron capture
Electrons
electrons
Fullerenes
control equipment
Hydrophobicity
hydrophobicity
caps
Electron energy levels

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Yang, Dong ; Zhang, Xiaorong ; Wang, Kai ; Wu, Congcong ; Yang, Ruixia ; Hou, Yuchen ; Jiang, Yuanyuan ; Liu, Shengzhong ; Priya, Shashank. / Stable Efficiency Exceeding 20.6% for Inverted Perovskite Solar Cells through Polymer-Optimized PCBM Electron-Transport Layers. In: Nano letters. 2019 ; Vol. 19, No. 5. pp. 3313-3320.
@article{9d0aa543afd4461b8969d12efb975245,
title = "Stable Efficiency Exceeding 20.6{\%} for Inverted Perovskite Solar Cells through Polymer-Optimized PCBM Electron-Transport Layers",
abstract = "Fullerene derivative, such as [6,6]-phenyl C61 butyric acid methyl ester (PCBM), is widely used as an electron-transport layer (ETL) in inverted perovskite solar cell (PSC). However, its low electron mobility, complexity in achieving quality film formation, and severe nonradiative recombination at perovskite/PCBM interface due to the large electron capture region, lead to lower efficiency for inverted PSCs compared to the normal structures. Herein, we demonstrate an effective and practical strategy to overcome these challenges. Conjugated n-type polymeric materials are mixed together with PCBM to form a homogeneous bulk-mixed (HBM) continuous film with high electron mobility and suitable energy level. HBM film is found to completely cap the perovskite surface to enhance the electron extraction. The critical electron capture radius of the HBM decreases to 12.52 nm from 14.89 nm of PCBM due to the large relative permittivity, resulting in reduced nonradiative recombination at perovskite/HBM interface. The efficiency of inverted PSCs with HBM ETLs exceeds 20.6{\%} with a high fill factor of 0.82. Further, the stability of devices is improved owing to the high hydrophobicity of the HBM ETLs. Under ambient air condition after 45 days, the efficiency of inverted PSCs based on HBM remains 80{\%} of the initial value. This is significantly higher than the control devices which retain only 48{\%} of the initial value under similar aging conditions. We believe these breakthroughs in improving efficiency and stability of inverted PSCs will expedite their transition.",
author = "Dong Yang and Xiaorong Zhang and Kai Wang and Congcong Wu and Ruixia Yang and Yuchen Hou and Yuanyuan Jiang and Shengzhong Liu and Shashank Priya",
year = "2019",
month = "5",
day = "8",
doi = "10.1021/acs.nanolett.9b00936",
language = "English (US)",
volume = "19",
pages = "3313--3320",
journal = "Nano Letters",
issn = "1530-6984",
publisher = "American Chemical Society",
number = "5",

}

Stable Efficiency Exceeding 20.6% for Inverted Perovskite Solar Cells through Polymer-Optimized PCBM Electron-Transport Layers. / Yang, Dong; Zhang, Xiaorong; Wang, Kai; Wu, Congcong; Yang, Ruixia; Hou, Yuchen; Jiang, Yuanyuan; Liu, Shengzhong; Priya, Shashank.

In: Nano letters, Vol. 19, No. 5, 08.05.2019, p. 3313-3320.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Stable Efficiency Exceeding 20.6% for Inverted Perovskite Solar Cells through Polymer-Optimized PCBM Electron-Transport Layers

AU - Yang, Dong

AU - Zhang, Xiaorong

AU - Wang, Kai

AU - Wu, Congcong

AU - Yang, Ruixia

AU - Hou, Yuchen

AU - Jiang, Yuanyuan

AU - Liu, Shengzhong

AU - Priya, Shashank

PY - 2019/5/8

Y1 - 2019/5/8

N2 - Fullerene derivative, such as [6,6]-phenyl C61 butyric acid methyl ester (PCBM), is widely used as an electron-transport layer (ETL) in inverted perovskite solar cell (PSC). However, its low electron mobility, complexity in achieving quality film formation, and severe nonradiative recombination at perovskite/PCBM interface due to the large electron capture region, lead to lower efficiency for inverted PSCs compared to the normal structures. Herein, we demonstrate an effective and practical strategy to overcome these challenges. Conjugated n-type polymeric materials are mixed together with PCBM to form a homogeneous bulk-mixed (HBM) continuous film with high electron mobility and suitable energy level. HBM film is found to completely cap the perovskite surface to enhance the electron extraction. The critical electron capture radius of the HBM decreases to 12.52 nm from 14.89 nm of PCBM due to the large relative permittivity, resulting in reduced nonradiative recombination at perovskite/HBM interface. The efficiency of inverted PSCs with HBM ETLs exceeds 20.6% with a high fill factor of 0.82. Further, the stability of devices is improved owing to the high hydrophobicity of the HBM ETLs. Under ambient air condition after 45 days, the efficiency of inverted PSCs based on HBM remains 80% of the initial value. This is significantly higher than the control devices which retain only 48% of the initial value under similar aging conditions. We believe these breakthroughs in improving efficiency and stability of inverted PSCs will expedite their transition.

AB - Fullerene derivative, such as [6,6]-phenyl C61 butyric acid methyl ester (PCBM), is widely used as an electron-transport layer (ETL) in inverted perovskite solar cell (PSC). However, its low electron mobility, complexity in achieving quality film formation, and severe nonradiative recombination at perovskite/PCBM interface due to the large electron capture region, lead to lower efficiency for inverted PSCs compared to the normal structures. Herein, we demonstrate an effective and practical strategy to overcome these challenges. Conjugated n-type polymeric materials are mixed together with PCBM to form a homogeneous bulk-mixed (HBM) continuous film with high electron mobility and suitable energy level. HBM film is found to completely cap the perovskite surface to enhance the electron extraction. The critical electron capture radius of the HBM decreases to 12.52 nm from 14.89 nm of PCBM due to the large relative permittivity, resulting in reduced nonradiative recombination at perovskite/HBM interface. The efficiency of inverted PSCs with HBM ETLs exceeds 20.6% with a high fill factor of 0.82. Further, the stability of devices is improved owing to the high hydrophobicity of the HBM ETLs. Under ambient air condition after 45 days, the efficiency of inverted PSCs based on HBM remains 80% of the initial value. This is significantly higher than the control devices which retain only 48% of the initial value under similar aging conditions. We believe these breakthroughs in improving efficiency and stability of inverted PSCs will expedite their transition.

UR - http://www.scopus.com/inward/record.url?scp=85065041120&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85065041120&partnerID=8YFLogxK

U2 - 10.1021/acs.nanolett.9b00936

DO - 10.1021/acs.nanolett.9b00936

M3 - Article

C2 - 30986075

AN - SCOPUS:85065041120

VL - 19

SP - 3313

EP - 3320

JO - Nano Letters

JF - Nano Letters

SN - 1530-6984

IS - 5

ER -