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Charge transfer modification of inverted planar perovskite solar cells by NiO_(x)/sr:NiO_(x)bilayer hole transport layer

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Chinese Physics B 2022年第3期31卷 624-630页

作者： Qiaopeng Cui Liang Zhao Xuewen Sun Qiannan Yao Sheng Huang Lei Zhu Yulong Zhao Jian Song Yinghuai Qiang The Jiangsu Province Engineering Laboratory of High Efficient Energy Storage Technology and Equipments School of Materials Science and PhysicsChina University of Mining and TechnologyXuzhou 21116China Advanced Analysis&Computation Center China University of Mining and TechnologyXuzhou 21116China

Perovskite solar cells(PSCs) are the most promising commercial photoelectric conversion technology in the *** planar p–i–n structure cells have advantages in negligible hysteresis, low temperature preparation and excellent ***, for inverted planar PSCs, the non-radiative recombination at the interface is an important reason that impedes the charge transfer and improvement of power conversion efficiency. Having a homogeneous, compact, and energy-levelmatched charge transport layer is the key to reducing non-radiative recombination. In our study, NiO_(x)/sr:NiO_(x)bilayer hole transport layer(HTL) improves the holes transmission of NiO_(x)based HTL, reduces the recombination in the interface between perovskite and HTL layer and improves the device performance. The bilayer HTL enhances the hole transfer by forming a driving force of an electric field and further improves J_(sc). As a result, the device has a power conversion efficiency of 18.44%, a short circuit current density of 22.81 m A·cm^(-2) and a fill factor of 0.80. Compared to the pristine PSCs, there are certain improvements of optical parameters. This method provides a new idea for the future design of novel hole transport layers and the development of high-performance solar cells.

关键词： perovskite solar cells nickel oxide sr doping bilayer hole transport layer

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Crystal facet engineering of perovskite cobaltite with optimized electronic regulation for water splitting

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Science China Materials 2022年第10期65卷 2665-2674页

作者： Ya-Nan Zhou Feng-Ge Wang Yi-Nuo Zhen Jun Nan Bin Dong Yong-Ming Chai State Key Laboratory of Heavy Oil Processing College of Chemistry and Chemical EngineeringChina University of Petroleum(East China)Qingdao 266580China CNOOC Tianjin Chemical Research and Design Institute Co. LtdTianjin 300131China

The correlation between crystal facets and electronic configurations of perovskite is closely related to the intrinsic activity for water ***,we proposed a unique molten-salt method(MSM)to manipulate the electronic properties of LaCoO_(3) by fine-tuning its crystal facet and atomic ***_(3) samples with oriented(110)(LCO(110))and(111)(LCO(111))facets were motivated by a capping agent(sr^(2+)).Compared with the LCO(111)plane,the LCO(110)and sr-doped LCO(111)(LSCO(111))planes possessed higher O 2p positions,stronger Co 3d-O 2p covalencies,and higher Co spin states by inducing CoO_(6) distortion,thus leading to superior oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)***,the overpotentials at 10 mA cm^(−2) were 299,322,and 289 mV for LCO(110),LCO(111),and LSCO(111),*** addition,the(110)crystal facet and sr substitution bestowed enhanced stability on LaCoO_(3) due to the strengthened Co-O *** present work enlightens new avenues of regulating electronic properties by crystal facet engineering and atom doping and provides a valuable reference for the electron structure-electrocatalytic activity connection for OER and HER.

关键词： electronic structure crystal facet engineering sr doping LaCoO_(3) water splitting

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