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Abstract

In recent years, organic-inorganic hybrid perovskite solar cells have aroused the interest of a large number of researchers due to the advantages of large optical absorption coefficient, tunable bandgap and easy fabrication. Recently, the power conversion efficiency of organic-inorganic hybrid perovskite solar cells has been enhanced to more than 23% in laboratory. In solution processed perovskite solar cells, perovskite and charge transport layer are stacked together, due to the different crystallization rates leading to lattice mismatch near the surface region of perovskite film, resulting in a lot of interface defects, especially at the interface between perovskite and charge transport layer. What is more, the photo-induced free carriers must transfer across the interfaces to be collected. But the defects near the interface can trap photogeneration electrons, thus reducing the carrier lifetime and causing the charges to be recombined, which greatly influence the performance and stability of perovskite solar cells. Therefore, reducing and passivating these defects is critical for obtaining the high performance perovskite solar cells. Now, there have been made tremendous efforts devoting to advancing passivation techniques, such as doping and surface modification, for high efficiency perovskite solar cell with improved stability and reduced hysteresis. These approaches also contribute to improving the energy band alignment between carrier transport layers and perovskite absorber improving device performance, or resistance moisture to enhance device stability. In this review we mainly introduce the formation and the effect of defects on perovskite solar cells, analyze the mechanism for passivating the interfacial defects between charge transport layer and perovskite photo absorption layer for different materials, compare the effects of different passivation materials on the photovoltaic performance of perovskite solar cells, and summarize the role of these materials in passivating the defects. Finally we discuss the research trend and development direction of passivation defects in perovskite solar cells.

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Authors and contacts

Corresponding author:Zhu Cheng-Jun,cjzhu@imu.edu.cn; Zhan Yi-Qiang,yqzhan@fudan.edu.cn

Funds:Project supported by the National Natural Science Foundation of China (Grant No. 11564027).

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Cited By

DownLoad: Full-Size Img PowerPoint

Interface to be modified	Modifier		V_oc/V	J_sc/mA·cm^–2	FF	PCE/%	文献
SnO₂/MAPbI_xCl_3–x	LiF	W	1.15	21.62	0.73	18.33	[27]
SnO₂/MAPbI_xCl_3–x	LiF	W/O	1.08	20.40	0.71	15.60	[27]
SnO₂/MAPbI_xCl_3–x	KCl	W	1.12	21.82	0.79	19.44	[42]
SnO₂/MAPbI_xCl_3–x	KCl	W/O	1.08	21.59	0.76	18.12	[42]
TiO₂/MAPbI_xCl_3–x	CsBr	W	1.06	20.70	0.75	16.30	[44]
TiO₂/MAPbI_xCl_3–x	CsBr	W/O	0.99	18.70	0.69	13.10	[44]
SnO₂/MAPbI₃	Xanthate	W	1.06	22.61	0.70	18.41	[45]
SnO₂/MAPbI₃	Xanthate	W/O	1.03	21.74	0.73	16.56	[45]
SnO₂/MAPbI₃	APTES SAM	W	1.06	20.84	0.66	14.69	[46]
SnO₂/MAPbI₃	APTES SAM	W/O	1.16	21.23	0.69	17.03	[46]
SnO₂/MAPbI₃	DA SAM	W	1.05	21.80	0.73	16.87	[48]
SnO₂/MAPbI₃	DA SAM	W/O	1.04	19.96	0.67	14.05	[48]
TiO₂/MAPbI₃	Li-TiO₂	W	1.03	23.91	0.74	18.25	[52]
TiO₂/MAPbI₃	Li-TiO₂	W/O	1.01	22.46	0.69	15.64	[52]
TiO₂/MAPbI₃	HS	W	1.11	23.34	0.77	20.10	[49]
TiO₂/MAPbI₃	HS	W/O	1.09	21.29	0.74	17.20	[49]
TiO2/MAPbI₃	GABAH⁺I^–	W	1.00	19.20	0.62	12.00	[50]
TiO2/MAPbI₃	GABAH⁺I^–	W/O	—	—	—	8.00	[50]
TiO2/MAPbI₃	LA	W	0.99	22.40	0.64	14.22	[51]
TiO2/MAPbI₃	LA	W/O	0.95	17.08	0.66	10.76	[51]
TiO2/MAPbI₃	GnPs	W	1.00	23.67	0.69	15.14	[41]
TiO2/MAPbI₃	GnPs	W/O	0.97	22.33	0.80	19.23	[41]

DownLoad: CSV

Interface to be modified	Modifier		V_oc/V	J_sc/mA·cm^–2	FF	PCE/%	文献
MAPbI_xCl_3–x/Spiro-OMeTAD	IPFB	W	1.06	23.38	0.67	15.70	[47]
MAPbI_xCl_3–x/Spiro-OMeTAD	IPFB	W/O	1.02	23.80	0.57	13.00	[47]
MAPbI₃/Spiro-OMeTAD	GO	W	1.03	20.00	0.72	14.50	[59]
MAPbI₃/Spiro-OMeTAD	GO	W/O	0.93	18.50	0.64	10.00	[59]
MAPbI_xCl_3–x/Spiro-OMeTAD	Thiophene	W	0.95	20.70	0.68	13.10	[54]
MAPbI_xCl_3–x/Spiro-OMeTAD	Thiophene	W/O	1.02	21.30	0.68	15.30	[54]
MAPbI_xCl_3–x/Spiro-OMeTAD	Pyridine	W	0.95	20.70	0.68	13.10	[54]
MAPbI_xCl_3–x/Spiro-OMeTAD	Pyridine	W/O	1.05	24.10	0.72	16.50	[54]
MAPbI₃/Spiro-OMeTAD	V-pyridine	W	1.15	22.00	0.73	9.50	[55]
MAPbI₃/Spiro-OMeTAD	V-pyridine	W/O	0.80	19.20	0.63	18.50	[55]
MAPbI₃/Spiro-OMeTAD	F4TCNQ	W	1.04	19.40	0.70	15.30	[56]
MAPbI₃/Spiro-OMeTAD	F4TCNQ	W/O	1.06	20.30	0.75	18.10	[56]
MAPbI₃/Spiro-OMeTAD	ZnPc	W	1.09	23.23	0.77	19.56	[65]
MAPbI₃/Spiro-OMeTAD	ZnPc	W/O	1.08	22.93	0.76	18.83	[65]
MAPbI₃/Spiro-OMeTAD	TAP	W	1.05	23.49	0.75	18.51	[66]
MAPbI₃/Spiro-OMeTAD	TAP	W/O	0.99	22.09	0.71	15.53	[66]

DownLoad: CSV

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Vol. 68, Issue 15 - 2019-08-05

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