TY - JOUR
T1 - Improving Efficiency and Stability of Perovskite Solar Cells Enabled by A Near-Infrared-Absorbing Moisture Barrier
AU - Hu, Qin
AU - Chen, Wei
AU - Yang, Wenqiang
AU - Li, Yu
AU - Zhou, Yecheng
AU - Larson, Bryon
AU - Johnson, Justin
AU - Lu, Yi-Hsien
AU - Zhong, Wenkai
AU - Xu, Jinqui
AU - Klivansky, Liana
AU - Wang, Cheng
AU - Salmeron, Miquel
AU - Djurisic, Aleksandra
AU - Lui, Feng
AU - He, Zhubing
AU - Zhu, Rui
AU - Russell, Thomas
N1 - Publisher Copyright:
© 2020 Elsevier Inc.
PY - 2020/7/15
Y1 - 2020/7/15
N2 - Simultaneously improving device efficiency and stability is the most important issue in perovskite solar cell (PSC) research. Here, we strategically introduce a multi-functional interface layer (MFIL) with integrated roles of: (1) electron transport, (2) moisture barrier, (3) near-infrared photocurrent enhancement, (4) trap passivation, and (5) ion migration suppression to enhance the device performance. The narrow-band-gap non-fullerene acceptor, Y6, was screened out to replace the most commonly used PCBM in the inverted PSCs. A significantly improved power conversion efficiency of 21.0% was achieved, along with a remarkable stability (up to 1,700 h) without encapsulation under various external stimuli (light, heat, and moisture). Furthermore, systematic studies of the molecular orientation or passivation and the charge carrier dynamics at the interface between perovskite and MFIL were presented. These results offer deep insights for designing advanced interlayers and establish the correlations between molecular orientation, interface molecular bonding, trap state density, non-radiation recombination, and the device performance.
AB - Simultaneously improving device efficiency and stability is the most important issue in perovskite solar cell (PSC) research. Here, we strategically introduce a multi-functional interface layer (MFIL) with integrated roles of: (1) electron transport, (2) moisture barrier, (3) near-infrared photocurrent enhancement, (4) trap passivation, and (5) ion migration suppression to enhance the device performance. The narrow-band-gap non-fullerene acceptor, Y6, was screened out to replace the most commonly used PCBM in the inverted PSCs. A significantly improved power conversion efficiency of 21.0% was achieved, along with a remarkable stability (up to 1,700 h) without encapsulation under various external stimuli (light, heat, and moisture). Furthermore, systematic studies of the molecular orientation or passivation and the charge carrier dynamics at the interface between perovskite and MFIL were presented. These results offer deep insights for designing advanced interlayers and establish the correlations between molecular orientation, interface molecular bonding, trap state density, non-radiation recombination, and the device performance.
KW - charge carrier dynamics
KW - device stability
KW - moisture barrier
KW - molecular bonding
KW - NIR absorption
KW - perovskite solar cells
KW - solar-photochemistry
UR - http://www.scopus.com/inward/record.url?scp=85087587617&partnerID=8YFLogxK
U2 - 10.1016/j.joule.2020.06.007
DO - 10.1016/j.joule.2020.06.007
M3 - Article
AN - SCOPUS:85087587617
SN - 2542-4351
VL - 4
SP - 1575
EP - 1593
JO - Joule
JF - Joule
IS - 7
ER -