Journal of Materials Chemistry A
·
2018
·Vol. 7
·期 3
·1124-1137
·
IF 9.931
Liangxin Zhu,Chong Chen,Fumin Li,Zhitao Shen,Yujuan Weng,Qingsong Huang,Mingtai Wang
To improve the charge separation and transport efficiency in perovskite solar cells (PSCs) with a TiO2-based hybrid mesoscopic/planar architecture, CdS and Cd(SCN2H4)2Cl2 are incorporated into the CH3NH3PbI3 active layer through in situ synthesis to prepare CdS:Cd(SCN2H4)2Cl2:CH3NH3PbI3 bulk-heterojunction films for PSCs. The incorporated CdS and Cd(SCN2H4)2Cl2 improve the quality of perovskite films. Moreover, Cd(SCN2H4)2Cl2 can effectively reduce the defect state density on the CH3NH3PbI3 crystal surface, which decreases charge recombination and facilitates charge transport in PSCs. Furthermore, first-principles calculations show that the I atom of CH3NH3PbI3 has a strong interaction with the Cd atom of CdS, which induces interfacial charge redistribution and charge transfer at the CH3NH3PbI3/CdS interface and therefore decreases the energy of the CH3NH3PbI3:CdS composite system, leading to more efficient electron–hole separation and improved structural stability of the perovskite bulk-heterojunction film. For the above reasons, the CdS:Cd(SCN2H4)2Cl2:CH3NH3PbI3 bulk-heterojunction cell shows much higher efficiency and better stability than the PSCs with pure CH3NH3PbI3. The highest efficiency reaches 20.1%, which is 1.16 times that (17.3%) of the PSCs with pure CH3NH3PbI3 and is also much higher than those of previously reported CH3NH3PbI3 PSCs with a compact/mesoporous TiO2 film. Our research results may provide a new understanding for improving the structural stability and performance of PSCs.
研究领域:
材料科学
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物理化学
·
太阳能技术
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Qiaocan Huang,Zunxian Yang,Yuanqing Zhou,Yuliang Ye,Bingqing Ye,Zihong Shen,Wenbo Wu,Zongyi Meng,Zhiwei Zeng,Hongyi Hong,Songwei Ye,Zhiming Cheng,Qianting Lan,Jiaxiang Wang,Ye Chen,Hui Zhang,Tailiang Guo,Fushan Li,Yongyi Chen,Zhenzhen Weng
Quantum dots (QDs) with an alloy shell (CdSe@ZnS/ZnS) are one of the most promising emitters for optoelectronic devices for their superior properties such as narrow full width at half maximum (FWHM), high color purity and tunable wavelength. However, the presence of lattice stresses during the internal growth of quantum dots can cause severe exciton bursts. Optimizing the ramp-up process during the core growth of quantum dots and rising the temperature when cladding with ZnS shells is an effective strategy for obtaining high-quality quantum dots. Besides, the stability of quantum dots is further modified by using 1-Octanethiol (OT) as ligands. Detailed analyses of the morphology, colloidal stability, and luminescence performance of QDs were represented. Finally, green CdSe@ZnS/ZnS QLEDs with prolonged carrier lifetimes and less defect state densities achieved peak luminescence at 361850 cd/m 2 with a current efficiency (CE) of 33 cd/A. This work provides a better understanding of the relationship between defect state density and the performance of quantum dots for designing and fabricating high-performance light-emitting diodes.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Guodong Su,Benlin He,Zekun Gong,Yang Ding,Jialong Duan,Yuanyuan Zhao,Haiyan Chen,Qunwei Tang
Carbon-based all-inorganic CsPbBr 3 perovskite solar cells (PSCs) have attracted growing interests due to low cost and excellent tolerances toward moisture, temperature, oxygen and ultraviolet light. However, carrier recombination of CsPbBr 3 film and large energy level differences at CsPbBr 3 /carbon interface are still the most crucial problem for further enhancement of power conversion efficiency. In the current study, an intermediate energy level at CsPbBr 3 /carbon interface and CsPbBr 3 film passivation are employed by coating hexane solution of CsPbBr x I 3-x nanocrystals (NCs) on the perovskite layer. Through systematic study on interfacial engineering , it is found that CsPbBr x I 3-x NCs with tunable energy level can remarkably reduce energy loss and hexane under passivation treatment can enlarge perovskite grain size as well as reduce trap state density. A champion power conversion efficiency of 9.45% is achieved for CsPbI 3 NCs tailored all-inorganic CsPbBr 3 PSC in comparison with 5.26% for NCs-free device, with the unencapsulated carbon-based CsPbBr 3 PSC exhibiting remarkable long-term stability over 900 h in 80% relative humidity air atmosphere at 25 °C. This work provides an effective approach to promote charge extraction and reduce defect states density as well as enhance the performance of PSCs.
研究领域:
材料科学
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
Solar RRL
·
2020
·Vol. 4
·期 10
·2000362
·
IF 7.527
Xueke Li,Benlin He,Zekun Gong,Jingwei Zhu,Wenyu Zhang,Haiyan Chen,Yanyan Duan,Qunwei Tang
Carbon-based CsPbBr 3 perovskite solar cells (PSCs) without hole-transporting layers (HTLs) have aroused extensive attention due to their low manufacturing cost and prominent ambient stability. However, the defects of perovskite film and the poor charge extraction within PSCs result in severe charge recombination, which restricts the further enhancement of device efficiency. In view of this critical point, a compositional engineering of CsPbBr 3 perovskite via doping with Cl − ions is presented herein to decrease the trap states and enhance the charge extraction. It is revealed that the doping of Cl − ions not only enlarges the grain size and thereby reduces the trap-state density, but also optimizes the energy-level alignment and improves the hole mobility of the perovskite film, leading to an evidently suppressed charge recombination and improved charge extraction and transportation. As a result, a champion power conversion efficiency (PCE) of 9.73% is achieved for carbon-based HTL-free CsPbBr 2.98 Cl 0.02 PSC, yielding a marked enhancement in comparison with 6.69% efficiency for the control. Meanwhile, the thermal and moisture stabilities of unencapsulated CsPbBr 2.98 Cl 0.02 PSC are improved, maintaining 93% and 95% of the initial PCE after expose to air atmosphere with 80% relative humidity (RH) and at 80 °C over 60 days, respectively.
研究领域:
材料科学
·
太阳能电池技术
·
光电化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2017
·Vol. 5
·期 2
·1700131
·
IF 9.034
Wangen Zhao,Zhun Yao,Fengyang Yu,Dong Yang,Shengzhong (Frank) Liu
Organic–inorganic hybrid halide perovskites are proven to be a promising semiconductor material as the absorber layer of solar cells. However, the perovskite films always suffer from nonuniform coverage or high trap state density due to the polycrystalline characteristics, which degrade the photoelectric properties of thin films. Herein, the alkali metal ions which are stable against oxidation and reduction are used in the perovskite precursor solution to induce the process of crystallization and nucleation, then affect the properties of the perovskite film. It is found that the addition of the alkali metal ions clearly improves the quality of perovskite film: enlarges the grain sizes, reduces the defect state density, passivates the grain boundaries, increases the built-in potential ( V bi ), resulting to the enhancement in the power conversion efficiency of perovskite thin film solar cell.
研究领域:
材料科学
·
光伏技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2017
·
IF 4.536
Wei-Long Xu,Meng-Si Niu,Xiao-Yu Yang,Peng-Qing Bi,Kang-Ning Zhang,Chao Xiong,Hong-Chun Yuan,Trevor A. Smith,Kenneth P. Ghiggino,Xiao-Tao Hao
Perovskite microplates have important implications in the fields of functional electronics and optoelectronics. We report a facile strategy, antisolvent treatment for the growth of perovskite microplates. The morphology and crystalline quality of the microplates could be controlled by the amount of the chlorobenzene antisolvent used. An appropriate amount of antisolvent facilitates the formation of high-quality perovskite microplates with no residual precursor remaining. Spatially and temporally resolved fluorescence measurements demonstrate the heterogeneity of defect-state density and recombination processes in various perovskite microplate regions. The body center shows higher defect state density when compared with that at the edge or the corner of the microplate. Excessive antisolvent degrades the microplates into smaller particles. The results of this study reveal the factors that influence the crystallization process and photophysical dynamics of perovskite microplates.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2021
·
IF 4.837
Jiadong Zang,Caiyun Zhang,Yue Qiang,Qi Liu,Yuemeng Fei,Ze Yu
Metal halide perovskite solar cells (PSCs) have made remarkable progress recently. However, the large number of defects in the polycrystalline perovskite film has an important impact on the carrier recombination and ion migration in the device. The non-radiative recombination is regarded as the main way of charge loss, which largely determines the performance of PSCs. Here, a small molecule, 2-mercaptopyrimidine (MPM), was selected as the surface passivator for MAPbI 3 perovskite films. It is revealed that both S and N atoms in MPM can interact with uncoordinated Pb 2+ to passivation the surface defects. As a result, the devices based on MPM passivation achieve a higher power conversion efficiency (PCE) of 19.71% than the control devices (17.85%) due to the reduced surface defect state density. Moreover, MPM-passivated PSCs also possess superior humidity stability, retaining 94% and 82% of the initial PCEs after 720 and 480 h aging in air with a relative humidity of 30% and 60%, respectively.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY
·
2021
·
IF 5.742
Peng Zhang,Junjie Si,Fei Wang,Chong Jia,Yiqing Chen
At present, the inferior stability compared to the high power conversion efficiency (PCE) for halide perovskite solar cells (PSCs) is the foremost drawback to impede their potential applications. Here, our work incorporate bifunctional polycaprolactone (PCL) agent into perovskite precursors in order to enhance the performance and stability of the humid air-fabricated perovskite solar cells (PSCs). The mechanism of efficiency and stability improvement can be resulted from assist in growth of perovskite grain and passivation of trap states in grain boundaries. The proved reduction of defect-state density can be ascribed to the cross-link function of PCL agent with C O bond, which was distributed along the grain boundaries and could play the synthetic role of Lewis base and acid, consequently resulting in the suppressed carrier recombination both in the bulk perovskite films and interfaces. The corresponding best performance device generates a conversion efficiency of 19.78%, 26.6% higher than that of the pristine device and retains ~88% of the initial values after 21 days’ storage without any encapsulation in ambient air. The proposed bifunctional adding strategy and the mechanism study could probe into the improvement of both efficiency and stability of the PSCs fabricated under fully open air conditions.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
ORGANIC ELECTRONICS
·
2022
·
IF 3.868
Xiaofang Ye,Hongkun Cai,Qinghe Sun,Tie Xu,Jian Ni,Juan Li,Jianjun Zhang
Recently, 2D/3D halide perovskites solar cells (PSCs) attract extensive attention due to simultaneous improved efficiency and stability. However, the types of alkyl ammonium salts, including the type of functional groups, the number of carbon atoms in the hydrocarbon chain , as well as the arrangement and distribution of the molecular structure, have a great impact on the performance and stability of films and devices. Herein, we compare the passivation capacity and moisture resistance of 2D capping layer based on three structurally similar alkyl ammonium salts (Butyl Ammonium Iodide (BAI), Propyl Ammonium Iodide (PAI), Ethyl Ammonium Iodide (EAI)) on triple cation perovskite thin films . As the number of carbon atoms in the alkane increases, the water contact angle gradually increases. Moreover, the defect state density is reduced to a certain extent compared to untreated 3D perovskite. The optimal PSCs with PAI-based 2D capping layer exhibit a power conversion efficiency (PCE) of 21.22% and remain 79.5% of initial PCE after 720 h. In addition, the reduced defect state density and improved crystallinity can be attributed to the hydrogen bonding interaction between the amine group and the [PbI 6 ] 4- framework. The emergence and development of 2D/3D perovskites have brought greater hope to commercialize the PSCs.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
Joule
·
2025
·
IF 35.4
Qingbin Cai,Qin Tan,Jiacheng He,Siyuan Tang,Qiang Sun,Dong He,Tianle Cheng,Guoqiang Ma,Jinfeng Huang,Gangsen Su,Chuanxin Chen,Hao Gu,Bingzhe Wang,Jing Fan,Guichuan Xing,Zhubing He
Inverted perovskite solar cells without pre-depositing a layer of hole-transport materials (HTL-free PSCs) still suffer from the non-irradiative recombination at the perovskite/electron-transport layer (ETL) interface. In this work, we report a molecular complementary passivation (MCP) strategy by employing propylphosphonic acid 3-ammonium bromide (PPAABr) to cooperate with phenethylammonium bromide (PEABr) to mutually passivate surface defects of I and formamidinium (FA) vacancies by multi-coordination. This passivation led to an obvious decrease in interfacial defect-state density and greatly improved exciton and carrier lifetime for the perovskite film. Moreover, MCP surface treatment pushes the perovskite surface Fermi level closer to that of ETL, thereby enhancing interfacial electron extraction. As a result, MCP-based HTL-free PSC achieved a record efficiency of 26.40% (25.92% certified). The encapsulated device retains 94.8% of its initial efficiency after 1,000 h of light soaking. The generality of the MCP strategy also generated a competitive efficiency of 23.66% for 1.68 eV wide-band-gap PSCs.
研究领域:
材料科学
·
能源技术
·
光电转换
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Qianyu Liu,Zhu Ma,Yanlin Li,Guangyuan Yan,Dejun Huang,Shanyue Hou,Weiya Zhou,Xin Wang,Jie Ren,Yan Xiang,Rui Ding,Xuelin Yue,Zhuowei Du,Meng Zhang,Wenfeng Zhang,Lianfeng Duan,Yuelong Huang,Yaohua Mai
At present, the highest power conversion efficiency (PCE) of perovskite solar cells (PSCs) has exceeded 25%, which exhibits great potential for commercial applications. Obtaining pinhole-free, superior crystal, and high-quality perovskite films with fewer defects by adjusting the lead iodide (PbI 2 ) intermediate films in a two-step sequential deposition has become research arousing general interest. Herein, a heterogeneous lead iodide (HLI) structure with two (0 0 1) interplanar distances (9.0 Å and 6.9 Å), can optimize the crystallization process of perovskite to get better surface morphology and is constructed by intercalated choline chloride (a kind of vitamin B4, VB4). HLI simultaneously improves the carrier lifetime of perovskite film from 1.96 µs to 3.28 µs and reduces defect state density. Together with better morphology and lower defect state density, the open circuit voltage ( V OC ) and PCE based on (FAPbI 3 ) 0.97 (MAPbBr 3 ) 0.03 is significantly boosted. In addition, with double-sided modification, HLI produces an excellent PCE of 24.27% with a V OC of 1.21 V. We believe that the novel heterogeneous PbI 2 structure could be a generic method to improve the efficiency of PSCs.
研究领域:
材料科学
·
能源研究
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Salman Riaz,Min Liu,Zhenwu Zhong,Hongyu Mi,Weizhi Zheng,Yi Xiao,Ying Qi,Muhammad Salik Qureshi,Shayan Umar,Yahong Xie
Carbon-based perovskite solar cells (C-PSCs) hold significant promise for enhancing the long-term stability and commercial viability of perovskite solar cells (PSCs). However, the power conversion efficiency (PCE) of C-PSCs is limited by excessive charge carrier recombination, which arises from defects within the perovskite material as well as at the interfaces between the perovskite and charge transport layers (CTLs). This study reports a dual-interface modification (DIM) technique aimed at reducing trap-state densities and interstitial defects at the tin dioxide (SnO 2 )/perovskite interface while simultaneously enhancing interfacial quality and crystallinity within the perovskite layer. SnO₂ incorporated with agmatine sulfate (AGTS) as the electron transport layer (ETL) along with benzyl dimethyl hexadecyl ammonium chloride (HDBAC) to passivate the perovskite surface. This dual-interface modification (DIM) of the SnO 2 /perovskite interface has demonstrated a reduction in the number of interstitial defects and trap-state densities, while enhancements within the perovskite layer itself have led to improved crystallinity and notable improvements in light absorption properties. The DIM-modified C-PSCs achieve a PCE of 16.09 %, representing a significant enhancement of 32.10 % compared to a PCE of 12.18 % for the pristine device. Furthermore, the DIM-treated PSC retains 90 % of its initial PCE after 31 days at room temperature and ambient humidity.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）