TY - JOUR
T1 - Gaining Insight into the Effect of Organic Interface Layer on Suppressing Ion Migration Induced Interfacial Degradation in Perovskite Solar Cells
AU - Ning, Jiaoyi
AU - Zhu, Yanan
AU - Hu, Zhao
AU - Shi, Yuhao
AU - Ali, Muhammad Umair
AU - He, Junpeng
AU - He, Yaowu
AU - Yan, Feng
AU - Yang, Shihe
AU - Miao, Jingsheng
AU - Meng, Hong
N1 - Funding Information:
This work was financially supported by National Natural Science Foundation of China (51903005), China (Shenzhen)-Canada Technology Collaboration Project (GJHZ20180420180725249), China (Shenzhen)-American Technology Collaboration Project (GJHZ20180928163206500), Shenzhen Science and Technology Research Grant (JCYJ20170818090312652, JCYJ20170818085627721), Shenzhen Hong Kong Innovation Circle joint R & D project (SGLH20161212101631809), Shenzhen Peacock Plan (KQTD2014062714543296) and Shenzhen Engineering Laboratory (Development and Reform Commission of Shenzhen Municipality [2016]1592). A spelling mistake in the affiliations, errors in the x-axis of Figure 1a, the Figure 1 caption, and an error in the first entry in Table 1 were rectified on August 26, 2020.
Publisher Copyright:
© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/8/1
Y1 - 2020/8/1
N2 - Ion migration induced interfacial degradation is a detrimental factor for the stability of perovskite solar cells (PSCs) and hence requires special attention to address this issue for the development of efficient PSCs with improved stability. Here, an “S-shaped, hook-like” organic small molecule, naphthalene diimide derivative (NDI-BN), is employed as a cathode interface layer (CIL) to tailor the [6,6]-phenylC61-butyric acid methylester (PCBM)/Ag interface in inverted PSCs. By realizing enhanced electron extraction capability via the incorporation of NDI-BN, a peak power conversion efficiency of 21.32% is achieved. Capacitance–voltage measurements and X-ray photoelectron spectroscopy analysis confirmed an obvious role of this new organic CIL in successfully blocking ionic diffusion pathways toward the Ag cathode, thereby preventing interfacial degradation and improving device stability. The molecular packing motif of NDI-BN further unveils its densely packed structure with π–π stacking force which has the ability to effectually hinder ion migration. Furthermore, theoretical calculations reveal that intercalation of decomposed perovskite species into the NDI clusters is considerably more difficult compared with the PCBM counterparts. This substantial contrast between NDI-BN and PCBM molecules in terms of their structures and packing fashion determines the different tendencies of ion migration and unveils the superior potential of NDI-BN in curtailing interfacial degradation.
AB - Ion migration induced interfacial degradation is a detrimental factor for the stability of perovskite solar cells (PSCs) and hence requires special attention to address this issue for the development of efficient PSCs with improved stability. Here, an “S-shaped, hook-like” organic small molecule, naphthalene diimide derivative (NDI-BN), is employed as a cathode interface layer (CIL) to tailor the [6,6]-phenylC61-butyric acid methylester (PCBM)/Ag interface in inverted PSCs. By realizing enhanced electron extraction capability via the incorporation of NDI-BN, a peak power conversion efficiency of 21.32% is achieved. Capacitance–voltage measurements and X-ray photoelectron spectroscopy analysis confirmed an obvious role of this new organic CIL in successfully blocking ionic diffusion pathways toward the Ag cathode, thereby preventing interfacial degradation and improving device stability. The molecular packing motif of NDI-BN further unveils its densely packed structure with π–π stacking force which has the ability to effectually hinder ion migration. Furthermore, theoretical calculations reveal that intercalation of decomposed perovskite species into the NDI clusters is considerably more difficult compared with the PCBM counterparts. This substantial contrast between NDI-BN and PCBM molecules in terms of their structures and packing fashion determines the different tendencies of ion migration and unveils the superior potential of NDI-BN in curtailing interfacial degradation.
KW - high-efficiency
KW - interfacial degradation
KW - organic interface layer
KW - perovskite solar cells
KW - stability
UR - http://www.scopus.com/inward/record.url?scp=85087780156&partnerID=8YFLogxK
U2 - 10.1002/adfm.202000837
DO - 10.1002/adfm.202000837
M3 - Journal article
AN - SCOPUS:85087780156
SN - 1616-301X
VL - 30
JO - Advanced Functional Materials
JF - Advanced Functional Materials
IS - 35
M1 - 2000837
ER -