ACS Applied Energy Materials
·
2025
·
IF 5.5
Dongxue Fan,Kai Cui,Yang Li,Caiqin Miao,Qun Wang,Xiaohong Wu
Flexible perovskite solar cells (F-PSCs) have demonstrated remarkable potential for next-generation wearable platforms. Nonetheless, the reduction of open-circuit voltage (VOC) at the interface within F-PSCs poses a significant barrier to improving the photoelectric conversion efficiency (PCE). Herein, we reported an effective “two birds with one stone” strategy by utilizing carbon dots (CDs) as a multifunctional treatment modulator to modify the SnO2 electron transport layer (ETL) and buried interface. On the one hand, CDs were explored to passivate trap states associated with Sn dangling bonds and oxygen vacancies on SnO2 surfaces through Lewis acid–base coordination, thereby enhancing the electron mobility of SnO2 films and facilitating charge extraction from perovskite layers. On the other hand, the functional groups (including carboxyl, fluorine, and amino) on CDs enable the formation of coordination and hydrogen bonding with PbI2, promoting the formation of high-quality perovskite films with reduced defect densities. The collective enhancements effectively mitigate trap-assisted charge recombination and interfacial energy loss, significantly reducing the device voltage deficit and enabling F-PSCs to attain a PCE of 22.97% with enhanced VOC from 1.06 to 1.18 V. Notably, CDs-incorporated devices demonstrate exceptional operational durability, maintaining 83% of initial PCE after 400 h of continuous illumination (AM 1.5G) in an air atmosphere and retaining 81% PCE following 4000 cyclic bending tests (6 mm radius). This methodology establishes a robust framework for simultaneously enhancing both the efficiency and stability in FAPbI3-based F-PSCs.
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ACS Applied Nano Materials
·
2025
·
IF 5.5
Zejiang Gao,Li Chen,Shaohong Li,Xingyu Pan,Yu Liu,Ge Gao,Bingsuo Zou
Metal halide perovskites have emerged as promising functional materials for high-performance photodetectors owing to their exceptional properties, including high-absorption coefficient, low-exciton binding energy, and near-unity photoluminescence quantum yields. However, their practical applications in photodetection remain constrained by intrinsic carrier recombination losses. Herein, we report the rational design of type-II CsPbBr3/ZnS heterostructured nanocrystals (NCs) through interfacial band engineering to address this challenge. Advanced characterization combining transmission electron microscopy, ultraviolet photoelectron spectroscopy, and density functional theory calculations confirms the formation of a staggered band alignment at the heterointerface. This unique electronic structure facilitates fast charge separation and inhibits carrier recombination compared to pristine CsPbBr3 NCs. Benefiting from the advantages of CsPbBr3/ZnS heterostructured NCs, we demonstrate a self-powered photodetector with excellent detection capability under 365 nm illumination: photosensitivity of 1.38 × 104, responsivity of 37.5 mA/W, and specific detectivity of 1.21 × 1012 Jones at zero bias. The interfacial engineering strategy presented in this work establishes a universal approach for developing high-efficiency perovskite optoelectronics with tailored charge transport dynamics.
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FUEL
·
2024
·
IF 6.7
Xiaoxiao Ding,Yatao Yang,Weihong Jiao,Zequan Zeng,Zhanggen Huang
The heteroatom doping into the activated carbon (AC) has been proved to be one of powerful tools to remove dioxins from sintering flue gas. However, the fact that the intrinsic enhanced mechanism of specific nitrogen species still remains unanswered makes the choice and design of AC suitable for dioxins elimination difficult. Herein, nitrogen-doping AC with alterable N species were prepared by melamine modification to in-depth illuminate the promotional roles of N-containing groups on the adsorption of chlorobenzene (CB) (a model compound for dioxins) over ACs through experimental and density functional theory (DFT). The results demonstrated that the N-doping was obviously conducive to CB adsorption, and pyrrole N group with the strongest adsorption energy (−0.84 eV) between AC-pyrrole and CB was determined to be the key adsorption sites for CB. ACM600 with more pyrrole N group prominently improved the chemical adsorption of total adsorption amount from 8.18 % to 15.12 %. The adsorption mechanism of CB onto ACs was governed by physical adsorption and weak chemical adsorption, which was attributed to the synergistic effects of π-π stacking interaction and hydrogen bonds, and the π-π stacking interaction dominated the adsorption interactions. The introduction of heteroatom N enhanced the adsorption capacity by promoting the chemical reactivity and π-electron density distribution of AC, and forming more significant π-π stacking interaction with the π-acceptor. The study provided a sound theoretical guideline and scientific foundation for the design and estimation of carbonaceous materials for dioxins abatement.
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Applied Physics Reviews
·
2024
·Vol. 11
·期 1
·
IF 11.9
Zhao Shuangyi,Zhao Jinrong,Qaid Saif M. H.,Liang Dehai,An Kang,Cai Wensi,Qian Qingkai,Zang Zhigang
Flat-panel x-ray scintillators with a high spatial resolution at a low radiation dose rate are desirable for efficient imaging applications in medical diagnostics, security inspection, and nondestructive inspection. To promote the progress of x-ray imaging technologies, it is of great interest to explore transparent scintillators with reduced light scattering, high light yields, and uniform radioluminescence. Herein, we design and prepare a novel lead-free (C 12 H 28 N) 2 Cu 2 I 4 metal halide featuring a high luminescent efficiency and white emission benefiting from the double self-trapped exciton mechanism, which enable to not only match the response of semiconductor-based sensors but also enhance light yields and decrease exposed doses to objects. Furthermore, transparent, and flexible scintillators with large areas of 20.25 cm 2 demonstrate an outstanding scintillation performance including a high spatial resolution of 19.8 lp mm −1 and an ultralow detection limit of 28.39 nGy air s −1 , which are ∼4 times higher and 194 times lower than typical values for medical imaging, respectively. This work provides not only a new route to explore promising alternatives with broadband emission but also a novel opportunity to develop flexible x-ray imaging technology.
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Small
·
2025
·
IF 12.1
Zhenhua Ge,Shengyi Yang,Zhenheng Zhang,Mingdong Hong,Mingzhu Liu,Ayesha Zia,Yurong Jiang,Bingsuo Zou,Libin Tang
High-sensitivity infrared photodetectors have attracted attention due to their broad applications. Photomultiplication is an ideal choice for high-sensitivity photodetectors since it can generate large photogenerated current under incident faint illumination, making them more user-friendly and cost-effective without any extra amplifier circuits. In this work, 2 wt.% acetic acid in methanol is optimized to treat the electron-accumulated ZnO layer in photodetector ITO/ZnO/PbS/Ag by increasing its interfacial oxygen vacancies, thus the interfacial band bends at the ZnO/PbS interface due to the accumulated charges under illumination. In this way, a high-gain photomultiplication-type photodetector ITO/ZnO/PbS/Ag, in which PbS colloidal quantum dots (CQDs) act as the active layer, is presented. As a result, a high responsivity of 524 A/W with a high external quantum efficiency of 66516% is achieved from the photodetector ITO/ZnO/PbS/Ag under 0.2 µW cm −2 980 nm illumination at -1 V. Further, a low turn-on voltage of 2 V is obtained from the upconverters ITO/ZnO/PbS(240 nm)/TAPC(50 nm)/CBP:Ir(ppy) 3 (60 nm)/BCP(20 nm)/LiF(1nm)/Al under 1.637 mW cm −2 980 nm illumination, exhibiting a photon-to-photon conversion efficiency of 11.08%. In addition, upconversion imaging through a single-pixel device and a 16 × 16 display array is demonstrated, implying its potential scalable applications. Therefore, it provides a promising and applicable pathway for high-performance upconverters.
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Nano-Micro Letters
·
2025
·Vol. 17
·期 1
·1-15
·
IF 36.3
Zheng Haiying,Liu Guozhen,Dong Xinhe,Chen Feifan,Wang Chao,Yu Hongbo,Zhang Zhihua,Pan Xu
Interface modification has been demonstrated as an effective means to enhance the performance of perovskite solar cells. However, the effect depends on the anchoring mode and strength of the interfacial molecules, which determines whether long-term robust interface for carrier viaduct can be achieved under operational light illumination. Herein, we select squaric acid (SA) as the interfacial molecule between the perovskite and SnO 2 layer and propose a self-regulated bilateral anchoring strategy. The unique four-membered ring conjugated structure and dicarboxylic acid groups facilitate stable hydrogen bonds and coordination bonds at both SnO 2 /SA and SA/PbI 2 interfaces. The self-transforming property of SA enables the dynamic bilateral anchoring at the buried interface, ultimately releasing residual stress and constructing a stable interfacial molecular bridge. The results show that SA molecular bridge not only can effectively inhibit the generation of diverse charged defects but also serves as an effective electron transport pathway, resulting in improved power conversion efficiency (PCE) from 23.19 to 25.50% and excellent stability at the maximum power point. Additionally, the PCEs of the flexible and large-area (1 cm 2 ) devices were increased to 24.92% and 24.01%, respectively, demonstrating the universal applicability of the bilateral anchoring to PSCs based on different substrates and larger area.
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MOLECULES
·
2024
·Vol. 29
·期 17
·4009
·
IF 4.2
Yongjun Wei,Feiping Lu,Xinqi Ai,Ju Lei,Yong Bai,Zhiang Wei,Ziyin Chen
Perovskite solar cells (PSCs) are considered the most promising photovoltaic devices to replace silicon-based solar cells because of their low preparation cost and high photoelectric conversion efficiency (PCE). Reducing defects in perovskite films is an effective means to improve the efficiency of PSCs. In this paper, a lead chelator was selected and mixed into hole transport layers (HTLs) to design and prepare mesoporous PSCs with the structure of ITO/PTAA(BCP)/Al2O3/PVK/PCBM/BCP/Ag, and its modification effect on the buried interface at the bottom of the perovskite layer in the mesoporous structure was explored. The experimental results show that in the presence of mesoporous alumina, the lead chelator can still play a role in modifying the bottom of the perovskite film. The use of lead chelator as passivation material added to the HTL can effectively reduce the residue of dimethyl sulfoxide (DMSO) and decrease the defects at the bottom of the perovskite film, which dramatically improves the device performance. The PCE of the device is increased from 18.03% to 20.78%, which is an increase of 15%. The work in this paper provides an effective method to enhance the performance of PSCs.
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Nano-Micro Letters
·
2025
·Vol. 17
·期 1
·1-13
·
IF 36.3
Zhang Qi,Zhao Qiangqiang,Wang Han,Yao Yiguo,Li Lei,Wei Yulin,Xu Ruida,Zhang Chenyang,Shalenov Erik O.,Tu Yongguang,Wang Kai,Xiao Mingjia
By anchoring the perovskite sites with the functional groups of CzBP (P = O···Pb, N–H···I and P = O···N–H), the bulk nonradiative recombination is suppressed and ion migration is inhibited. Doping perovskite films with CzBP led to enhanced intercrystallite interactions in the bulk and improved photoluminescence quantum yield.
Using a typical electron-rich moiety as the π-linker to replace the classic alkyl spacer in CzBP facilitated the charge-carrier transport processes and the passivation effect of carbazole further contributed to high V OC . The optimized 2,7-CzBP-treated device achieves the highest power conversion efficiency (PCE) of 25.88%, with V OC of 1.189 V for 0.090 cm 2 and the perovskite solar cell module with a PCE of 21.04% for 14 cm 2 .
For 2,7-CzBP, the more extended conjugation and the more linear molecular geometry result in a more effective improvement in the performance.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-10
·
IF 14.7
Su Qiang,Chen Zinan,Chen Shuming
The electron injection and transport behavior are of vital importance to the performance of quantum-dot light-emitting diodes. By simultaneously measuring the electroluminescence-photoluminescence of the quantum-dot light-emitting diodes, we identify the presence of leakage electrons which leads to the discrepancy of the electroluminescence and the photoluminescence roll-off. To trace the transport paths of the leakage electrons, a single photon counting technique is developed. This technique enables us to detect the weak photon signals and thus provides a means to visualize the electron transport paths at different voltages. The results show that, the electrons, except those recombining within the quantum-dots, leak to the hole transport layer or recombine at the hole transport layer/quantum-dot interface, thus leading to the reduction of efficiency. By reducing the amount of leakage electrons, quantum-dot light-emitting diode with an internal power conversion efficiency of over 98% can be achieved.
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Nature Photonics
·
2024
·
IF 32.3
Mu Ge,Tan Yimei,Bi Cheng,Liu Yanfei,Hao Qun,Tang Xin
Photodetection over a broad spectral range is necessary for multispectral sensing and imaging. Despite the fact that broadband single-element detectors with high performance have been demonstrated with various low-dimensional materials, broadband focal plane array imagers have been rarely reported. Here we propose a stacked lead sulfide/mercury telluride colloidal quantum dot photodetector configuration with optimized graded energy gaps. This architecture allows for ultrabroadband spectral response from 0.4 to 5.0 µm, with responsivity values of 0.23, 0.31, 0.83 and 0.71 A W −1 at 0.4, 0.7, 2.2 and 4.2 µm, respectively. We also fabricate a focal plane array imager with a resolution of 640 × 512, a low photoresponse non-uniformity down to 6% and a noise equivalent temperature difference as low as 34 mK. We demonstrate broadband imaging by simultaneously capturing both short-wave infrared and mid-wave infrared information, as well as multispectral imaging in the red, green, blue, short-wave infrared and mid-wave infrared channels, using a set of optical filters.
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Energy Technology
·
2024
·
IF 3.6
Jingyang Lin,Yanling He,Hongbo Mo,Abdul Khaleed,Zhilin Ren,Yin Li,Yingnan Cao,Jinyao Tang,Wei-Ting Wang,Shien-Ping Feng,Zhao Sun,Wen-Di Li,Tao Zhu,Gang Li,Alan Man Ching Ng,Aleksandra B. Djurišić
Flexible perovskite solar cells (fPSCs) prepared on flexible plastic substrates exhibit poor stability under illumination in ambient, due to inferior gas barrier properties of plastic substrates. Herein, we investigated effect of different modifications of the back surface of the substrate to improve stability under illumination in ambient. T 80 under simulated solar illumination at maximum power point in ambient (ISOS-L-1) can be increased from 80 h to over 350 h with the deposition of a single layer (by spin-coating or by atomic layer deposition (ALD)). While ALD layers resulted in the best T 80 value and significant reduction of the oxygen transmission rate compared to other modifications even for very low film thickness (≈10 nm), a simple solution-processed spin-on-glass barrier layer also enables significant (more than 4 times) improvement in device stability. This work illustrates the importance of barrier layers for decreasing the ingress of oxygen and moisture into fPSCs through the plastic substrate.
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Small
·
2025
·
IF 12.1
Hui Liu,Yuyang Li,Li Ding,Lixiang Wang,Weien Lai,Deren Yang,Yanjun Fang
Perovskites nanocrystals (PNCs) have garnered significant research interest in X-ray detection due to their strong X-ray absorption capability, and unique advantages in large area and thick film deposition that result from the decoupling of perovskite crystallization from film formation. However, traditional long-chain ligands used in PNCs, such as oleic acid and oleyl amine, suffer from poor conductivity and susceptibility to detachment, which limits the performance of X-ray detectors based on them. In this study, a strategy is proposed to partially replace long-chain ligands with short-chain counterparts like phenethylammoniumbromide (PEABr) and CF 3 PEABr, during the synthesis of CsPbBr 3 PNCs. This approach leads to a lower defect density, enhanced carrier transport, and suppressed ion migration simultaneously in the resulting PNCs. These PNCs are then combined with organic bulk heterojunction to construct the nanocomposite X-ray detectors, which exhibit an impressive sensitivity of 10787 µC Gy air ⁻¹ cm⁻ 2 and stable dark current baseline under a large electric field of ≈17 000 V cm −1 . Finally, a flat panel X-ray imaging sensor is prepared by monolithically integrating the nanocomposite film with a thin-film transistor backplane, enabling high-resolution and real-time X-ray imaging. The image quality is further enhanced through a super-resolution reconstruction approach, effectively facilitating a wide range of practical applications in real-world scenarios.
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