TY - JOUR
T1 - Conjugated Molecules “Bridge”
T2 - Functional Ligand toward Highly Efficient and Long-Term Stable Perovskite Solar Cell
AU - Dong, Hua
AU - Xi, Jun
AU - Zuo, Lijian
AU - Li, Jingrui
AU - Yang, Yingguo
AU - Wang, Dongdong
AU - Yu, Yue
AU - Ma, Lin
AU - Ran, Chenxin
AU - Gao, Weiyin
AU - Jiao, Bo
AU - Xu, Jie
AU - Lei, Ting
AU - Wei, Feijie
AU - Yuan, Fang
AU - Zhang, Lin
AU - Shi, Yifei
AU - Hou, Xun
AU - Wu, Zhaoxin
PY - 2019/4/25
Y1 - 2019/4/25
N2 - Interfacial ligand passivation engineering has recently been recognized as a promising avenue, contributing simultaneously to the optoelectronic characteristics and moisture/operation tolerance of perovskite solar cells. To further achieve a win-win situation of both performance and stability, an innovative conjugated aniline modifier (3-phenyl-2-propen-1-amine; PPEA) is explored to moderately tailor organolead halide perovskites films. Here, the conjugated PPEA presents both “quasi-coplanar” rigid geometrical configuration and distinct electron delocalization characteristics. After a moderate treatment, a stronger dipole capping layer can be formed at the perovskite/transporting interface to achieve favorable banding alignment, thus enlarging the built-in potential and promoting charge extraction. Meanwhile, a conjugated cation coordinated to the surface of the perovskite grains/units can form preferably ordered overlapping, not only passivating the surface defects but also providing a fast path for charge exchange. Benefiting from this, a ≈21% efficiency of the PPEA-modified solar cell can be obtained, accompanied by long-term stability (maintaining 90.2% of initial power conversion efficiency after 1000 h testing, 25 °C, and 40 ± 10 humidity). This innovative conjugated molecule “bridge” can also perform on a larger scale, with a performance of 18.43% at an area of 1.96 cm2.
AB - Interfacial ligand passivation engineering has recently been recognized as a promising avenue, contributing simultaneously to the optoelectronic characteristics and moisture/operation tolerance of perovskite solar cells. To further achieve a win-win situation of both performance and stability, an innovative conjugated aniline modifier (3-phenyl-2-propen-1-amine; PPEA) is explored to moderately tailor organolead halide perovskites films. Here, the conjugated PPEA presents both “quasi-coplanar” rigid geometrical configuration and distinct electron delocalization characteristics. After a moderate treatment, a stronger dipole capping layer can be formed at the perovskite/transporting interface to achieve favorable banding alignment, thus enlarging the built-in potential and promoting charge extraction. Meanwhile, a conjugated cation coordinated to the surface of the perovskite grains/units can form preferably ordered overlapping, not only passivating the surface defects but also providing a fast path for charge exchange. Benefiting from this, a ≈21% efficiency of the PPEA-modified solar cell can be obtained, accompanied by long-term stability (maintaining 90.2% of initial power conversion efficiency after 1000 h testing, 25 °C, and 40 ± 10 humidity). This innovative conjugated molecule “bridge” can also perform on a larger scale, with a performance of 18.43% at an area of 1.96 cm2.
KW - conjugation
KW - delocalization
KW - interfacial dipole
KW - perovskite
KW - solar cells
UR - http://www.scopus.com/inward/record.url?scp=85061076335&partnerID=8YFLogxK
U2 - 10.1002/adfm.201808119
DO - 10.1002/adfm.201808119
M3 - Article
AN - SCOPUS:85061076335
SN - 1616-301X
VL - 29
SP - 1
EP - 11
JO - Advanced Functional Materials
JF - Advanced Functional Materials
IS - 17
M1 - 1808119
ER -