Importance of Functional Groups in Cross-Linking Methoxysilane
Additives for High-Efficiency and Stable Perovskite Solar Cells
Posted on 2019-08-21 - 12:14
Here we report an efficient and reproducible multifunctional additive
engineering strategy via methoxysilane cross-linking agents functionalized
by the different terminal group, moderate electron-donating −SH,
weak electron-donating −CH3, or strong electron-withdrawing
−CN, into a PbI2 precursor solution. The power conversion
efficiency (PCE) is increased from 18.4 to 20.8% after introduction
of (3-mercaptopropyl)trimethoxysilane (MPTS) containing a −SH
group as a consequence of improved voltage and current density, while
3-cyanopropyltriethoxysilane (CPTS) containing a −CN
group deteriorates the overall photovoltaic performance. Moreover,
−SH in MPTS is found to passivate defects effectively through
a Lewis acid–base interaction with PbI2, resulting
in a larger grain size and a longer carrier lifetime. Owing to the
formation of a cross-linking siloxane network as a protective layer
on the grain boundary, the thermal and moisture stability of the device
are improved remarkably. The present work provides a guideline for
multifunctional additive engineering for the purpose of simultaneous
achievement of a high PCE and long-term stability.
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Xie, Lin; Chen, Jiangzhao; Vashishtha, Parth; Zhao, Xing; Shin, Gwang Su; Mhaisalkar, Subodh G.; et al. (2019). Importance of Functional Groups in Cross-Linking Methoxysilane
Additives for High-Efficiency and Stable Perovskite Solar Cells. ACS Publications. Collection. https://doi.org/10.1021/acsenergylett.9b01356
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AUTHORS (7)
LX
Lin Xie
JC
Jiangzhao Chen
PV
Parth Vashishtha
XZ
Xing Zhao
GS
Gwang Su Shin
SM
Subodh G. Mhaisalkar
NP
Nam-Gyu Park
KEYWORDS
methoxysilane cross-linking agents functionalizedCPTSmoisture stabilitypassivate defectsmultifunctional additive engineeringpower conversion efficiencyPCEPbI 2electron-donatingFunctional Groupscarrier lifetimeCross-Linking Methoxysilane Additivesmultifunctional additive engineering strategyterminal groupcross-linking siloxane networkCHMPTSCNStable Perovskite Solar CellsSHPbI 2 precursor solutiongrain boundaryphotovoltaic performancegrain size