Issue 41, 2019

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

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

Supplementary files

Article information

Article type
Paper
Submitted
20 Feb 2019
Accepted
24 Mai 2019
First published
25 Mai 2019

J. Mater. Chem. A, 2019,7, 23895-23903

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, 7, 23895 DOI: 10.1039/C9TA01947B

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