TY - JOUR
T1 - Synergistic Reinforcement of Built-In Electric Fields for Highly Efficient and Stable Perovskite Photovoltaics
AU - Wang, Wei Ting
AU - Chen, Peter
AU - Chiang, Chien Hung
AU - Guo, Tzung Fang
AU - Wu, Chun Guey
AU - Feng, Shien Ping
N1 - Funding Information:
This work was supported by the General Research Fund of the Research Grants Council of Hong Kong Special Administrative Region, China under Award Number 17204516 and 17206518, and Environment and Conservation Fund (ECF 49/2017). This work was also supported by the Seed Fund for Strategic Interdisciplinary Research Scheme at the University of Hong Kong. The authors would like to thank Prof. Xiaowei Zhan (Peking University) for the instructions on fabricating the control device. Part of the work was carried out in Advanced Laboratory of Accommodation and Research for Organic Photovoltaics, MOST, Taiwan, ROC.
Funding Information:
This work was supported by the General Research Fund of the Research Grants Council of Hong Kong Special Administrative Region, China under Award Number 17204516 and 17206518, and Environment and Conservation Fund (ECF 49/2017). This work was also supported by the Seed Fund for Strategic Interdisciplinary Research Scheme at the University of Hong Kong. The authors would like to thank Prof. Xiaowei Zhan (Peking University) for the instructions on fabricating the control device. Part of the work was carried out in Advanced Laboratory of Accommodation and Research for Organic Photovoltaics, MOST, Taiwan, ROC.
Publisher Copyright:
© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2020/5/1
Y1 - 2020/5/1
N2 - Perovskite solar cells (PSCs) have received great attention due to their outstanding performance and their low processing costs. To boost their performance, one approach is to reinforce the built-in electric field (BEF) to promote oriented carrier transport. The BEF is maximized by reinforcing the work function difference between cathode and anode (Δμ1) and increasing the work function difference between lower and upper surfaces of perovskite film (Δμ2) via introduction of electric dipole molecules, denoted as PTFCN and CF3BACl. The synergistic reinforcement of BEF improves charge transport and collection, and realizes markedly high photovoltaic performances with the best power conversion efficiency (PCE) up to 21.5%, a growth of 15.6% as compared to the control device, which is higher than the superposition of improvements achieved by either raising Δμ1 or Δμ2. Importantly, dual-functional CF3BACl not only supplies dipole effect for tuning the surface potential of perovskite but offers hydrophobic trifluoride group toward the long-term stable unencapsulated PSCs retaining more than 95% PCE after storing 2000 h under ambient conditions. This work demonstrates the synergistic effect of Δμ1 and Δμ2, providing an effective strategy for the further development of PSC in terms of photovoltaic conversion and stability.
AB - Perovskite solar cells (PSCs) have received great attention due to their outstanding performance and their low processing costs. To boost their performance, one approach is to reinforce the built-in electric field (BEF) to promote oriented carrier transport. The BEF is maximized by reinforcing the work function difference between cathode and anode (Δμ1) and increasing the work function difference between lower and upper surfaces of perovskite film (Δμ2) via introduction of electric dipole molecules, denoted as PTFCN and CF3BACl. The synergistic reinforcement of BEF improves charge transport and collection, and realizes markedly high photovoltaic performances with the best power conversion efficiency (PCE) up to 21.5%, a growth of 15.6% as compared to the control device, which is higher than the superposition of improvements achieved by either raising Δμ1 or Δμ2. Importantly, dual-functional CF3BACl not only supplies dipole effect for tuning the surface potential of perovskite but offers hydrophobic trifluoride group toward the long-term stable unencapsulated PSCs retaining more than 95% PCE after storing 2000 h under ambient conditions. This work demonstrates the synergistic effect of Δμ1 and Δμ2, providing an effective strategy for the further development of PSC in terms of photovoltaic conversion and stability.
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U2 - 10.1002/adfm.201909755
DO - 10.1002/adfm.201909755
M3 - Article
AN - SCOPUS:85081545447
SN - 1616-301X
VL - 30
JO - Advanced Functional Materials
JF - Advanced Functional Materials
IS - 19
M1 - 1909755
ER -