TY - JOUR
T1 - Holistic energy landscape management in 2D/3D heterojunction via molecular engineering for efficient perovskite solar cells
AU - Ma, Ke
AU - Sun, Jiaonan
AU - Atapattu, Harindi R.
AU - Larson, Bryon W.
AU - Yang, Hanjun
AU - Sun, Dewei
AU - Chen, Ke
AU - Wang, Kang
AU - Lee, Yoonho
AU - Tang, Yuanhao
AU - Bhoopalam, Anika
AU - Huang, Libai
AU - Graham, Kenneth R.
AU - Mei, Jianguo
AU - Dou, Letian
N1 - Publisher Copyright:
© 2023 The Authors.
PY - 2023/6
Y1 - 2023/6
N2 - Constructing two-dimensional (2D) perovskite atop of 3D with energy landscape management is still a challenge in perovskite photovoltaics. Here, we report a strategy through designing a series of π-conjugated organic cations to construct stable 2D perovskites and to realize delicate energy level tunability at 2D/3D heterojunctions. As a result, the hole transfer energy barriers can be reduced both at heterojunctions and within 2D structures, and the preferable work function shift reduces charge accumulation at interface. Leveraging these insights and also benefitted from the superior interface contact between conjugated cations and poly(triarylamine) (PTAA) hole transporting layer, a solar cell with power conversion efficiency of 24.6% has been achieved, which is the highest among PTAA-based n-i-p devices to the best of our knowledge. The devices exhibit greatly enhanced stability and reproducibility. This approach is generic to several hole transporting materials, offering opportunities to realize high efficiency without using the unstable Spiro-OMeTAD.
AB - Constructing two-dimensional (2D) perovskite atop of 3D with energy landscape management is still a challenge in perovskite photovoltaics. Here, we report a strategy through designing a series of π-conjugated organic cations to construct stable 2D perovskites and to realize delicate energy level tunability at 2D/3D heterojunctions. As a result, the hole transfer energy barriers can be reduced both at heterojunctions and within 2D structures, and the preferable work function shift reduces charge accumulation at interface. Leveraging these insights and also benefitted from the superior interface contact between conjugated cations and poly(triarylamine) (PTAA) hole transporting layer, a solar cell with power conversion efficiency of 24.6% has been achieved, which is the highest among PTAA-based n-i-p devices to the best of our knowledge. The devices exhibit greatly enhanced stability and reproducibility. This approach is generic to several hole transporting materials, offering opportunities to realize high efficiency without using the unstable Spiro-OMeTAD.
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U2 - 10.1126/sciadv.adg0032
DO - 10.1126/sciadv.adg0032
M3 - Article
C2 - 37285424
AN - SCOPUS:85161181374
VL - 9
JO - Science advances
JF - Science advances
IS - 23
M1 - eadg0032
ER -