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Oligomeric Silica-Wrapped Perovskites Enable Synchronous Defect Passivation and Grain Stabilization for Efficient and Stable Perovskite Photovoltaics

Journal Article


Abstract


  • The intrinsic instability of hybrid perovskite materials induced by defect states arises as one major challenge hampering the commercialization of perovskite solar cells (PSCs). Here, we report a facile strategy of wrapping perovskite grains within an oligomeric silica (OS) matrix in a core-shell geometry, which can synchronously passivate the defects at surfaces and grain boundaries and stabilize the grains at the nanoscale. We observe a significant reduction of trap density and elongation of carrier lifetime in OS-wrapped perovskites, which yields an increased efficiency of 21.5% for p-i-n structured PSCs with a decent open-circuit voltage of 1.15 V and a fill factor of 0.81. This all-around nanoscale grain wrapping leads to remarkable improvement of the operational stability of PSCs, sustaining 80% of the efficiency after "burn-in" under full sunlight with UV for more than 5200 h. Our findings provide a new pathway towards efficient and stable PSCs.

UOW Authors


  •   Bai, Yang (external author)
  •   Lin, Yun (external author)
  •   Ren, Long (external author)
  •   Shi, Xiao-Lei (external author)
  •   Strounina, Ekaterina (external author)
  •   Deng, Yehao (external author)
  •   Wang, Qi (external author)
  •   Fang, Yanjun (external author)
  •   Zheng, Xiaopeng (external author)
  •   Lin, Yuze (external author)
  •   Chen, Zhi-Gang (external author)
  •   Du, Yi
  •   Wang, Lianzhou (external author)
  •   Huang, Jinsong (external author)

Publication Date


  • 2019

Citation


  • Bai, Y., Lin, Y., Ren, L., Shi, X., Strounina, E., Deng, Y., Wang, Q., Fang, Y., Zheng, X., Lin, Y., Chen, Z., Du, Y., Wang, L. & Huang, J. (2019). Oligomeric Silica-Wrapped Perovskites Enable Synchronous Defect Passivation and Grain Stabilization for Efficient and Stable Perovskite Photovoltaics. ACS Energy Letters, 4 1231-1240.

Scopus Eid


  • 2-s2.0-85066891803

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/3680

Number Of Pages


  • 9

Start Page


  • 1231

End Page


  • 1240

Volume


  • 4

Place Of Publication


  • United States

Abstract


  • The intrinsic instability of hybrid perovskite materials induced by defect states arises as one major challenge hampering the commercialization of perovskite solar cells (PSCs). Here, we report a facile strategy of wrapping perovskite grains within an oligomeric silica (OS) matrix in a core-shell geometry, which can synchronously passivate the defects at surfaces and grain boundaries and stabilize the grains at the nanoscale. We observe a significant reduction of trap density and elongation of carrier lifetime in OS-wrapped perovskites, which yields an increased efficiency of 21.5% for p-i-n structured PSCs with a decent open-circuit voltage of 1.15 V and a fill factor of 0.81. This all-around nanoscale grain wrapping leads to remarkable improvement of the operational stability of PSCs, sustaining 80% of the efficiency after "burn-in" under full sunlight with UV for more than 5200 h. Our findings provide a new pathway towards efficient and stable PSCs.

UOW Authors


  •   Bai, Yang (external author)
  •   Lin, Yun (external author)
  •   Ren, Long (external author)
  •   Shi, Xiao-Lei (external author)
  •   Strounina, Ekaterina (external author)
  •   Deng, Yehao (external author)
  •   Wang, Qi (external author)
  •   Fang, Yanjun (external author)
  •   Zheng, Xiaopeng (external author)
  •   Lin, Yuze (external author)
  •   Chen, Zhi-Gang (external author)
  •   Du, Yi
  •   Wang, Lianzhou (external author)
  •   Huang, Jinsong (external author)

Publication Date


  • 2019

Citation


  • Bai, Y., Lin, Y., Ren, L., Shi, X., Strounina, E., Deng, Y., Wang, Q., Fang, Y., Zheng, X., Lin, Y., Chen, Z., Du, Y., Wang, L. & Huang, J. (2019). Oligomeric Silica-Wrapped Perovskites Enable Synchronous Defect Passivation and Grain Stabilization for Efficient and Stable Perovskite Photovoltaics. ACS Energy Letters, 4 1231-1240.

Scopus Eid


  • 2-s2.0-85066891803

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/3680

Number Of Pages


  • 9

Start Page


  • 1231

End Page


  • 1240

Volume


  • 4

Place Of Publication


  • United States