ACS Nano
·
2024
·
IF 15.8
Zhenyang Liu,Chaoqi Hao,Yejing Liu,Rongzhen Wu,Jianen Zhang,Zhuo Chen,Fenghe Wang,Li Guan,Xu Li,Aiwei Tang,Ou Chen
Short-wave infrared (SWIR) light-emitting diodes (LEDs) have emerged as promising technologies for diverse applications such as optical communication, biomedical imaging, surveillance, and machine vision. Colloidal quantum dots (QDs) are particularly attractive for SWIR LEDs due to their solution processability, compatibility with flexible substrates, and tunable absorption and luminescence. However, the presence of toxic elements or precious metals in most SWIR-emitting QDs poses health, environmental, and cost challenges. In this context, CuInS2 (CIS) QDs are known for low toxicity, cost-effective fabrication, and SWIR-light emitting capability. However, CIS QDs have not yet been directly utilized to fabricate SWIR LEDs to date, which is due to low particle stability, inefficient charge carrier recombination, and significantly blue-shifted luminescence after integrating into LED devices. To address challenges, we propose a dual-passivation strategy using ZnI2 as a chemical additive to enhance both the optical property of plain CIS QDs and charge carrier recombination upon LED device implementation. The resulting CIS-QD-based LEDs exhibit a stable SWIR electroluminescence (EL) peak (over 1000 nm) with a high EL radiance and a record external quantum efficiency in the SWIR region. Our study represents a significant step forward in SWIR-QLED technology, offering a pathway for the development of high-performance, low-cost, and nontoxic SWIR light sources.
研究领域:
材料科学
·
光电子学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zhipeng Wang,Rui Li,Tingting Ma,Shaorun Zhu,Leipeng Gao,Mei Zhang,Min Guo
In SnO 2 -based planar perovskite solar cells (SP–PSCs), stability issue derived by defects at grain boundaries (GBs) and surface in perovskite films has been one of the main reasons that limit its commercialization. Therefore, co-passivation of both defects is pivotal to maximize passivation effects for improving power conversion efficiency (PCE) and stability, which is rarely reported in SP-PSCs. Herein, two simple passivating agents including Pb(SCN) 2 and choline chloride (ChCl) were selected to dually passivate GBs and surface defects in the perovskite films (ambient atmosphere), respectively. The influences of co-passivation on PCE and ambient stability of devices were intensively studied, and the related mechanisms were also elucidated in detail. The dually-passivated device obtained a champion PCE of 19.98%, and maintained about 94% of the initial efficiency after being stored for ˃2700h aging in the humid air. The reduction of GBs and surface defects not only weakens the non-radiative recombination of carriers, but also inhibits the penetration of moisture and oxygen, which ultimately greatly enhances the PCE and stability of the device. This paper provides support for the dual passivation of GBs and surface defects to ameliorate ambient stability of the SP-PSCs, and also enriches the selectivity of passivation agents on dual passivation.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 43
·15974-15985
·
IF 4
Pengyun Zhang,Jie Xiong,Wei-Hsiang Chen,Pingfan Du,Lixin Song
In recent years, air-processed MAPbI3 perovskite solar cells (PSCs) have attracted widespread interest from researchers worldwide because of their simple and low-cost fabrication process. Nonetheless, the ambient conditions usually bring about many adverse effects, such as imperfect crystallization and numerous defects in perovskite films, which seriously impact both the photoelectric performance and stability of the device. Therefore, in this work, a polymer dual-passivation strategy was employed by introducing ammonium polyphosphate (APP) as an additive to the green anti-solvent to accurately modify the perovskite layer. APP, which has abundant phosphate and ammonium groups, could simultaneously fill the I/Pb vacancies by Lewis acid–base reactions to restrain defect formation and improve the power conversion efficiency (PCE) of the ultimate device. On the other hand, the long molecular chains of the polymer with a certain flexural ability were easily congregated at the grain boundaries of the perovskite grains, thus enhancing the bending resistance. Consequently, high-quality perovskite films with a dense morphology and large grain size were obtained. Because of the reduced defect density and suppressed non-radiative recombination, the optimal PSC attained a champion PCE of 20.87% with negligible hysteresis. Furthermore, the non-encapsulated APP-modified flexible device also exhibited excellent bending resistance. Only 20% of its normalized PCE was lost after 150 bending cycles at room temperature. This simple, green, low-cost, and reliable strategy for preparing high-efficiency PSCs with good stability can facilitate its commercialization.
研究领域:
材料科学
·
太阳能技术
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL PHYSICS
·
2023
·Vol. 158
·期 13
·
IF 4.4
Ye Xiaofang,Cai Hongkun,Xu Tie,Ni Jian,Zhang Jianjun
In recent years, perovskite solar cells (PSCs) have been attracting more and more attention. Although perovskite materials have high defect tolerance, defects remain the main factor that seriously affects the efficiency and stability of PSCs. Herein, the ionic liquid of 1-butyl, 3-methylimidazolium acetate ([BMIM][ACO]) was introduced into the SnO2/perovskite interface for the first time. Thanks to the dipoles formed by ILs spontaneously, the work function of SnO2 was reduced and the transport ability of carriers was improved as well. Moreover, the Lewis acidity and lone pair electrons of [BMIM][ACO] contribute to the passivation of I– defects, Pb2+ defects, or Pb-I anti site defects. In addition, the presence of dipoles will repel the approach of photogenerated holes and the reverse transport of electrons, reducing the recombination of defect sites through field-effect passivation. The solar cell with efficiency of 19.43% was obtained under such a dual passivation effect, and the best device maintained 75.21% of the initial efficiency after 80 h of continuous illumination.
研究领域:
材料科学
·
能源技术
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yanmei Zhou,Shaoru Wu,Guobin Huang,Jingbin Zeng,Benjamin Edem Meteku,Xiaohong Tan,Heng Lu,Feiming Li,Zhixiong Cai,Xudong Wang,Maosheng Zhang
Intrinsic and surface defects are the crucial factors that affect the stability and luminescence efficiency of nanocrystals (NCs). Ion-doping and surface passivation are considered as the most effective strategies to suppress the intrinsic and surface defects of NCs, respectively. Herein, an efficient and facile double passivation process, simultaneously realizes ion-doping and surface passivation, for Cs 3 Cu 2 X 5 (X Cl, Br and I) NCs is developed by using potassium oleate (K-OA) as passivator. K ion is used as ion-doping passivation and OA ion is used as the organic ligand for surface passivation of NCs. Compared to the free passivated NCs, the Photoluminescence quantum yield (PLQYs) of dual-passivated Cs 3 Cu 2 X 5 (X Cl, Br and I) NCs increase significantly from 2.87%, 11.6% and 49.4–31%, 69.9%, and 97.2%, respectively. Moreover, the stability of proposed NCs is greatly improved (Cs 3 Cu 2 Cl 5 NCs maintain 63% of PL efficiency after 100 h, Cs 3 Cu 2 Br 5 and Cs 3 Cu 2 I 5 NCs maintain 65% and 97% of PL efficiency after 100 days, respectively) at 50–86% relative humidity and room temperature under ambient atmosphere.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2025
·
IF 4.6
Yi Zhu,Feng Tong,Zheng Chen,Zijun Huang,Sheng Huang,Xiuquan Gu
This study addresses the challenge of synthesizing highly emissive and stable MAPbBr 3 nanocrystals (NCs) for practical device applications. A double-passivation approach was developed through using nitrogen-doped graphene quantum dots (NGQDs) and polyvinylidene fluoride (PVDF) during the in-situ synthesis of MAPbBr 3 NCs. By optimizing the amount of NGQDs, the resulting MAPbBr 3 /PVDF/NGQDs composite films exhibited green emission at 522 nm with a narrow spectral width of 17.7 nm. The films demonstrated exceptional stability, retaining 60 % of their initial photoluminescence (PL) intensity after 144 h of water immersion and 96 % of their initial intensity after 10 min of heating at 100 °C. This stability is attributed to the NGQDs reducing defects and acting as nitrogen-enhanced sites that promote consistent crystal formation. Additionally, the composite film was used to fabricate a white light-emitting diode (WLED) with a color gamut coverage rate of 125 % under the National Television Standards Committee (NTSC) standard and 93.8 % under the Rec.2020 standard. This work might present a synergistic strategy combining in-situ defect passivation with encapsulation, offering a viable solution to the stability-efficiency trade-off in perovskite NCs and advancing high-color-gamut flexible displays.
研究领域:
材料科学
·
光电技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2024
·
IF 6.3
Letu Siqin,Wenjing Xin,Ruijian Liu,Hongmei Luan,Lei Wang,Yiming Wang,Shuyu Li,Jingyuan Guo,Yu He,Jiayong Zhang,Bin Yao,Chengjun Zhu
Interfaces quality have always been considered the key factors in the fabrication of efficient Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells, and harmful defects at the interface can significantly reduce the performance of the device. Here, we propose a dual passivation strategy by adding Na to the surface of the absorber layer (CZTSSe) to passivate the CZTSSe/CdS interface and treating the buffer layer (CdS) using ultraviolet (UV) irradiation to passivate the CdS/ZnO interface. Due to the Na doping passivation, the absorber surface conductivity increases while the roughness decreases and detrimental defects that can lead to nonradiative recombination are reduced. The power conversion efficiency (PCE) of the cell is improved by about 1 percentage point by Na passivation. The contributions of open-circuit voltage ( V oc ), short-circuit current density ( J sc ), and fill factor (FF) to the improvement of PCE have been quantified as 50.64%, −5.58%, and 54.94%, indicating that Na doping can significantly boost V oc and FF. UV-ozone passivation reduces residual carbon organics in the CdS buffer layer , weakens carrier recombination, allows for more light absorption , and widens the depletion region , which favors efficient carrier collection. The estimated contribution of V oc , J sc , and FF to the PCE of the device is 8.78%, 119.59%, and −28.37%, respectively, demonstrating that UV-ozone passivation can significantly improve the J sc of the device. The two passivation strategies complement each other's advantages and achieve a synergistic effect . Our prepared champion device exhibits a PCE of 10.69% and remarkable long-term stability.
研究领域:
材料科学
·
光伏技术
·
界面工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2021
·Vol. 8
·期 5
·2001466
·
IF 16.806
Yali Chen,Xuejiao Zuo,Yiyang He,Fang Qian,Shengnan Zuo,Yalan Zhang,Lei Liang,Zuqin Chen,Kui Zhao,Zhike Liu,Jing Gou,Shengzhong (Frank) Liu
So far, most techniques for modifying perovskite solar cells (PSCs) focus on either the perovskite or electron transport layer (ETL). For the sake of comprehensively improving device performance, a dual-functional method of simultaneously passivating trap defects in both the perovskite and ETL films is proposed that utilizes guidable transfer of Eu 3+ in SnO 2 to perovskite. Europium ions are distributed throughout the SnO 2 film during the formation process of SnO 2 , and they can diffuse directionally through the SnO 2 /perovskite interface into the perovskite, while most of the europium ions remain at the interface. Under the synergistic effect of distributed Eu 3+ in the SnO 2 and aggregated Eu 3+ at the interface, the electron mobilities of ETLs are evidently improved. Meanwhile, diffused Eu 3+ ions passivate the perovskite to reduce trap densities at the grain boundaries, which can dramatically elevate the open-circuit voltage ( V oc ) of PSCs. Finally, the mainly PSCs coated on SnO 2 :Eu 3+ ETL achieve a power conversion efficiency of 20.14%. Moreover, an unsealed device degrades by only 13% after exposure to ambient atmosphere for 84 days.
研究领域:
材料科学
·
可再生能源
·
光伏技术
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Meidan Que,Hao Yuan,Qizhao Wu,Shenghui He,Peng Zhong,Bo Li
Formamidinium lead triiodide (FAPbI3) perovskite quantum dot has outstanding durability, reasonable carrier lifetime, and long carrier diffusion length for a new generation of highly efficient solar cells. However, ligand engineering is a dilemma because of the highly ionized and dynamic characteristics of quantum dots. To circumvent this issue, herein, we employed a mild solution-phase ligand-exchange approach through adding short-chain amino acids that contain amino and carboxyl groups to modify quantum dots and passivate their surface defects during the purification process. As a result, the photoelectric conversion efficiency of FAPbI3 perovskite quantum dot solar cells (PQDSCs) increased from 11.23 to 12.97% with an open-circuit voltage of 1.09 V, a short-circuit current density of 16.37 mA cm–2, and a filling factor of 72.13%. Furthermore, the stability of the device modified by amino acids retains over 80% of the initial efficiency upon being exposed to 20–30% relative humidity for 240 h of aging treatment. This work may offer an innovative concept and approach for surface ligand treatment to improve the photovoltaic performance of PQDSCs toward large-scale manufacture.
研究领域:
材料科学
·
纳米技术
·
太阳能
·
光伏技术
✓ 已验证
DOI
高影响因子
Sustainable Energy & Fuels
·
2025
·
IF 4.1
Guangli Liu,Haoju Li,Changzhong Wang,Yuhang Liang,Cheng Huang,Yaochen Xie,Longxiang Luo,Yannan Qian
Despite the advantages of good thermal stability and low cost, CsPbIxBr3−x all-inorganic carbon-based perovskite solar cells (C-IPSCs) still experience significant non-radiative recombination at the buried interface between the electron transport layer (ETL) and the perovskite, resulting in substantial energy losses that limit the power conversion efficiency (PCE) of C-IPSCs. Herein, a dual-passivation buried interface molecular bridge was constructed between the SnO2 and CsPbIxBr3−x layers by introducing 1-carboxymethyl-3-methylimidazolium chloride (HOOCMIMCl) to minimize interface defects and reduce non-radiative recombination. The results demonstrated the COOH groups and imidazolium cations in HOOCMIMCl can be simultaneously anchored on the surfaces of SnO2 and CsPbIxBr3−x perovskite layers, effectively passivating oxygen vacancies (Vo) on the SnO2 surface and the uncoordinated Pb2+ in the perovskite film. Meanwhile, after introducing dual-passivation buried interface molecular bridges, the energy barrier between the SnO2 and CsPbIxBr3−x layers was reduced, facilitating rapid carrier transport, while the crystallization of the perovskite film was also promoted, resulting in larger grain sizes and smoother films. In addition, the hydrogen bonding formed between the N–H groups and the CsPbIxBr3−x perovskite can suppress I− migration, releasing residual stress and enhancing the stability of the crystal structure. Compared to control CsPbIxBr3−x C-IPSCs with a PCE of 12.89% and Voc of 1.09 V, the champion target C-IPSCs exhibited significantly higher performance, with a PCE of 15.51% and Voc of 1.19 V. The unencapsulated target C-IPSCs can maintain 82% of their initial PCE after 1000 hours in a low-humidity air environment (T = 25 °C, RH = 20–25%), and 83.5% of the initial PCE after aging 200 hours in an N2 atmosphere at T = 85 °C.
研究领域:
光伏技术
·
材料科学
·
纳米技术
·
固体物理
·
可再生能源
✓ 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）