ACS Applied Materials & Interfaces
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2022
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IF 10.383
Xiangbao Yuan,Haiyun Li,Jing Fan,Lin Zhang,Feng Ran,Menglei Feng,Peiyuan Li,Weixiang Kong,Shijian Chen,Zhigang Zang,Shuangpeng Wang
The effect of substitutional metal dopants in NiOx on the structural and electronic structures is of great interest, particularly for increasing the p-type conductivities as a hole transport layer (HTL) applied in perovskite solar cells (PSCs). In this paper, experimental fabrications and density functional theory calculations have been carried out on Cd-doped NiOx films to examine the effect of divalent doping on the electronic and geometric structures of NiOx. The results indicate that divalent Cd dopants reduced the formation energy of the Ni vacancy (VNi) and created more VNi in the films, which enhanced the p-type conductivity of the NiOx films. In addition, Cd doping also deepened the valence band edge, reduced the monomolecular Shockley–Read–Hall (SRH) recombination losses, and promoted hole extraction and transport. Hence, the PSCs with Cd:NiOx HTLs manifest a high efficiency of 20.47%, a high photocurrent density of 23.00 mA cm–2, and a high fill factor of 79.62%, as well as negligible hysteresis and excellent stability. This work illustrates that divalent elements such as Cd, Zn, Co, etc. may be potential dopants to improve the p-type conductivity of the NiOx films for applications in highly efficient and stabilized PSCs.
研究领域:
材料科学
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能源科学
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计算化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2022
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IF 10.319
Liqi Li,Wenjian Shen,Chenquan Yang,Yuxi Dou,Xuehao Zhu,Yao Dong,Juan Zhao,Junyan Xiao,Fuzhi Huang,Yi-Bing Cheng,Jie Zhong
As a convenient, low-cost and up-scalable solution route, chemical bath deposition (CBD) has exhibited impressive advantages in fabricating electron transporting materials like SnO 2 , achieving record efficiencies for regular n-i-p perovskite solar cells (PSCs). However, for the hysteresis-free and potentially more stable inverted p-i-n PSCs, CBD processing is rarely studied to improve the device performance. In this work, we first present a CBD planar NiO x film as the efficient hole transport layer for the inverted perovskite solar cells (IPSCs). The morphologies and semiconducting properties of the NiO x film can be adjusted by varying the concentration of [Ni(H 2 O) x (NH 3 ) 6- x ] 2+ cation via in-situ monitoring of the CBD reaction process. The characterizations of ultraviolet photoelectron spectroscopy, transient absorption spectroscopy, time-resolved photoluminescence suggest that the CBD planar NiO x film possesses enhanced conductivity and aligned energy band levels with perovskite, which benefits for the charge transport in the IPSCs. The devices based on planar NiO x at 50 °C and low nickel precursor concentration achieved an enhanced efficiency from 16.14% to 18.17%. This work established an efficient CBD route to fabricate planar NiO x film for PSCs and paved the way for high performance PSCs with CBD-prepared hole transporting materials.
研究领域:
材料科学
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能源技术
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光伏器件
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产品关联
DOI
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 16
·1217
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IF 4.3
Xiaoyu Yao,Shuai Ding,Xiaoyu Shen,Congkai Guo,Yao Liu,Wenjuan Xia,Guohua Wu,Yaohong Zhang
In order to improve the electrochromic properties of NiOxfilms, Mg ions were introduced into NiOxfilms using the sol–gel method and the spin-coating method. The introduction of Mg ions leads to the loose structure of the compact NiOxfilm, which can provide more channels for the transport of OH−. In addition, the introduction of Mg ions increases the oxygen vacancies and oxygen interstitial defects in the NiOxfilm, which effectively increases the reactive sites and improves the charge transfer efficiency at the interface between the NiOxfilm and the electrolyte. The electrochemical results further show that the film electrode (NiOx-Mg2) has the largest charge storage capacity when the Mg doping concentration is 10%. Compared with the undoped NiOxfilm, the doping of Mg improves the transmittance modulation (ΔT) performance of the NiOxfilm (ΔTup to 55.8%) and shortens the response time (2.39 s/0.63 s for coloring/bleaching). In general, Mg doping is an effective method for improving the electrochromic properties of NiOxfilms.
研究领域:
材料科学
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电化学
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薄膜技术
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产品关联
DOI
PubMed
高影响因子
Journal of Energy Chemistry
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2020
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IF 7.216
Aili Wang,Zhiyuan Cao,Jianwei Wang,Shurong Wang,Chengbo Li,Nuo Li,Lisha Xie,Yong Xiang,Tingshuai Li,Xiaobin Niu,Liming Ding,Feng Hao
Nickel oxide (NiO x ) has exhibited great potential as an inorganic hole transport layer (HTL) in perovskite solar cells (PSCs) due to its wide optical bandgap and superior stability. In this study, we have modulated the Ni 2+ vacancies in NiO x film by controlling deposition temperature in a hot-casting process, resulting the change of coordination structure and charge state of NiO x . Moreover, the change of the HOMO level of NiO x makes it more compatible with perovskite to decrease energy losses and enhance hole carrier injection efficiency . Besides, the defect modulation in the electronic structure of NiO x is beneficial for increasing the electrical conductivity and mobility, which are considered to achieve the balance of charge carrier transport and avoid charge accumulation at the interface between perovskite and HTL effectively. Both experimental analyses and theoretical calculations reveal the increase of nickel vacancy defects change the electronic structure of NiO x by increasing the ratio of Ni 3+ /Ni 2+ and improving the p-type characteristics. Accordingly, an optimal deposition temperature at 120 °C enabled a 36.24% improvement in the power conversion efficiency compared to that deposited at room temperature (25 °C). Therefore, this work provides a facile method to manipulate the electronic structure of NiO x to improve the charge carrier transport and photovoltaic performance of related PSCs.
研究领域:
材料科学
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纳米技术
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能源技术
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固体物理
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光伏技术
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薄膜技术
✓ 已验证
DOI
高影响因子
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