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A polyaspartic acid sodium interfacial layer enhances surface trap passivation in perovskite solar cells

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Abstract

The characteristics of perovskite solar cells (PSC) are affected by interface traps. In this work, we introduce an interfacial modifier based on polyaspartic acid sodium (PASP) that is incorporated between a methylammonium lead iodide (MAPbI3) photo-absorber and P3CT-Na hole transporting layer. PASP contains a large number of –COO anions and Na+ cations, thus enabling a strong chelating cooperation for metal polyvalent ions. The incorporated PASP leads to an effective passivation of the surface traps originating from Pb2+ and I in MAPbI3 and control over the crystallization of MAPbI3 with slightly enlarged grains. The combined benefits with the introduced PASP enable boosting the power conversion efficiency to 20.05% with an impressive FF of 82.20% in MAPbI3 based p–i–n PSCs.

Graphical abstract: A polyaspartic acid sodium interfacial layer enhances surface trap passivation in perovskite solar cells

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Publication details

The article was received on 20 Feb 2019, accepted on 24 May 2019 and first published on 25 May 2019


Article type: Paper
DOI: 10.1039/C9TA01947B
J. Mater. Chem. A, 2019, Advance Article

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    A polyaspartic acid sodium interfacial layer enhances surface trap passivation in perovskite solar cells

    B. Wang, F. Wu, S. Bi, J. Zhou, J. Wang, X. Leng, D. Zhang, R. Meng, B. Xue, C. Zong, L. Zhu, Y. Zhang and H. Zhou, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA01947B

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