TY - JOUR
T1 - Highly efficient and stable inverted planar solar cells from (FAI)x(MABr)1−xPbI2 perovskites
AU - Yan, Weibo
AU - Rao, Haixia
AU - Wei, Chen
AU - Liu, Zhiwei
AU - Bian, Zuqiang
AU - Xin, Hao
AU - Huang, Wei
N1 - Publisher Copyright:
© 2017
PY - 2017/5/1
Y1 - 2017/5/1
N2 - We report highly efficient and stable inverted planar lead mixed-halide (Br, I) perovskite solar cells with a configuration of ITO/poly(3-bromothiophene)/(FA)y(MA)1−yPbBrxI3−x/C60/BCP/Ag (FA: HC(NH2)2+; MA: CH3NH3+). We found that small changes in the composition of (FA)y(MA)1−yPbBrxI3−x have big impact on the material properties and device performance. Appropriate Br-doping enlarges MAPbBrxI3−x's bandgaps and prolongs the life of the excited charge carrier, which leads to higher device open-circuit voltage (VOC). Replacing “MA” with “FA” extends the absorption of (FA)y(MA)1−yPbBrxI3−x which compensates the JSC loss in MAPbBrxI3−x from Br-doping. The optimized perovskite film with a composite of FA0.8MA0.2PbBr0.2I2.8 shows a lifetime of 670 ns and a photoelectric response to 830 nm, resulting in an enhanced JSC of 22.2 mA cm−2, a high FF of 0.80, and an efficiency of 18.1%. In addition, the inverted device based on FA0.8MA0.2PbBr0.2I2.8 showed long-term stability with 80% efficiency remained after 4 months in a glovebox without encapsulation. Our results demonstrate highly efficient and stable inverted planar perovskite solar cells can be achieved by optimizing absorber material composition, which offer a reference for their applications in flexible or tandem solar cells.
AB - We report highly efficient and stable inverted planar lead mixed-halide (Br, I) perovskite solar cells with a configuration of ITO/poly(3-bromothiophene)/(FA)y(MA)1−yPbBrxI3−x/C60/BCP/Ag (FA: HC(NH2)2+; MA: CH3NH3+). We found that small changes in the composition of (FA)y(MA)1−yPbBrxI3−x have big impact on the material properties and device performance. Appropriate Br-doping enlarges MAPbBrxI3−x's bandgaps and prolongs the life of the excited charge carrier, which leads to higher device open-circuit voltage (VOC). Replacing “MA” with “FA” extends the absorption of (FA)y(MA)1−yPbBrxI3−x which compensates the JSC loss in MAPbBrxI3−x from Br-doping. The optimized perovskite film with a composite of FA0.8MA0.2PbBr0.2I2.8 shows a lifetime of 670 ns and a photoelectric response to 830 nm, resulting in an enhanced JSC of 22.2 mA cm−2, a high FF of 0.80, and an efficiency of 18.1%. In addition, the inverted device based on FA0.8MA0.2PbBr0.2I2.8 showed long-term stability with 80% efficiency remained after 4 months in a glovebox without encapsulation. Our results demonstrate highly efficient and stable inverted planar perovskite solar cells can be achieved by optimizing absorber material composition, which offer a reference for their applications in flexible or tandem solar cells.
KW - (FA)(MA)PbBrI
KW - Broadened absorption spectra
KW - Bromine-doped perovskites
KW - Enhanced open-circuit voltages
KW - Enlarged bandgaps
KW - Inverted perovskite solar cells
UR - http://www.scopus.com/inward/record.url?scp=85015439650&partnerID=8YFLogxK
U2 - 10.1016/j.nanoen.2017.03.001
DO - 10.1016/j.nanoen.2017.03.001
M3 - 文章
AN - SCOPUS:85015439650
SN - 2211-2855
VL - 35
SP - 62
EP - 70
JO - Nano Energy
JF - Nano Energy
ER -
