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Paper-Based Constant Potential Electrochemiluminescence Sensing Platform with Black Phosphorus as a Luminophore Enabled by a Perovskite Solar Cell
摘要： Exploring e?cient luminophores in the electrochemiluminescence (ECL) system is highly desired to pursue a sensitive ECL sensing platform. Herein, the black phosphorus nanosheets (BP NSs) with excellent ECL properties are investigated and serve as the luminophore with the coreactant of peroxydisulfate (S2O8 2?) solution. Moreover, owing to the overlapping of emission and absorbance spectra, e?ective resonance energy transfer (RET) is realized between the BP NSs and the introduced Au nanoparticles. In order to achieve the portable and miniaturized developing trends for the paper-based ECL sensing platform, a paper-based perovskite solar cell (PSC) device is designed to act as the power source to replace the commonly utilized expensive and cumbersome electrochemical workstation. Bene?ting from that, a PSC driven paper-based constant potential ECL-RET sensing platform is constructed, thereby realizing sensitive microRNAs (miRNAs) detection. What’s more, to attain the preferable analytical performance, the duplex-speci?c nuclease (DSN) is also introduced to assist the target recycling signal ampli?cation strategy. Based on this, highly sensitive detection of miRNA-107 with a range from 0.1 pM to 15 nM is achieved by this designed sensing platform. Most importantly, this work not only pioneers a precedent for developing a high-sensitivity PSC triggered ECL sensing platform but also explores the application prospect of BP nanomaterial in the ?eld of bioanalysis.
关键词： microRNAs detection,resonance energy transfer,perovskite solar cell,black phosphorus nanosheets,electrochemiluminescence
更新于2025-09-23 15:21:01
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Improving the efficiency of perovskite solar cells using modification of CH3NH3PbI3 active layer: the effect of methylammonium iodide loading time
摘要： In perovskite (PSK) solar cells, the PSK absorber layer plays a vital role in power conversion efficiency (PCE). In this study, we report on the fabrication of mesoporous PSK solar cells using a two-step spin-coating rout with the structure of glass/FTO/compact TiO2/mesoporous TiO2/CH3NH3PbI3 (MAPbI3)/P3HT/Au. The morphology and crystalline structure of the PSK thin film is controlled by changing the CH3NH3I (MAI) loading times (the 20?s, 30?s, 40?s, 60?s) on PbI2 film. The PSK layers are optimized at different MAI loading times in a two-step process to enhance the PCE of the PSK solar cells. The investigation and comparison of the results show that the solar cell containing the absorber layer prepared by solution loading time of the 40?s is more efficient than the other devices. The champion device shows the open-circuit voltage (Voc) of 0.97?V, short current density (Jsc) of 19.30?mA/cm2, and fill factor (FF) of 0.64, which leads to the best PCE of 12.04%.
关键词： MAI loading time,MAPbI3,Perovskite solar cell,CH3NH3PbI3,Spins coating,Active layer
更新于2025-09-23 15:21:01
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Bis(4-methylthio)phenyl)amine-based hole transport materials for highly-efficient perovskite solar cells: insight into the carrier ultrafast dynamics and interfacial transport
摘要： Hole transport layers (HTLs) play a significant role in the performance of perovskite solar cells. A new class of linear small-molecules based on bis(4-methylthio)phenyl)amine as an end group, carbon, oxygen and sulfur as the center atoms for the center unit (denoted as MT-based small-molecule), respectively, have been applied as HTL, and two of them presented the efficiency over 20% in the planar inverted perovskite solar cells (PSCs), which demonstrated a significant improvement in comparison with the widely used HTL, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (known as PEDOT:PSS), in the planar inverted architecture. The ultrafast carrier dynamics show that the excited hot carrier cooling process of MT-based small-molecule HTL samples is faster than that of PEDOT:PSS samples. The kinetic analysis of photo-bleaching peaks of femtosecond transient absorption spectra reveals that the traps at the interface between MT-based small-molecule HTLs and MAPbI3 can be filled much quicker than that at PEDOT/MAPbI3 interfaces. Moreover, the hole injection time from MAPbI3 to MT-based small-molecule HTLs is around 10 times quicker than that to PEDOT:PSS. Such quick trap filling and hole extraction bring a significant enhancement in photovoltaic performances. These findings uncover the carrier transport mechanisms and illuminate a promising approach for the design of new HTLs for highly-efficient perovskite solar cells.
关键词： hole transport layer,perovskite solar cell,ultrafast carrier dynamics
更新于2025-09-23 15:21:01
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Mn Doping CsPbI3 Film Towards High-Efficiency Solar Cell
摘要： A doping technique that introduces suitable elements into the host material is extensively utilized to modulate perovskite lattice structure, stabilize crystallographic phases and achieve various optical and electronic properties. In this work, we substitute Pb2+ in CsPbI3 film with Mn2+ to improve the phase stability of the material. The crystalline quality of perovskite materials with Mn2+ doping is significantly improved, and the defect densitys is reduced. The power conversion efficiency (PCE) of an inorganic perovskite solar cell with optimized Mn2+ doping (2%) reached 16.52 %, which is higher than the 15.05% of the reference, with an enhancement of ~ 10%. Simultaneously, the humidity and thermal stability were boosted by the Mn doping, which is attributed to the introduction of Mn shrinking the lattice of the perovskite material and enhancing the formation energy of the CsPbI3 film.
关键词： Power Conversion Efficiency,Mn-Doping,CsPbI3,Phase Stability,Perovskite Solar cell
更新于2025-09-23 15:21:01
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Heterojunction Incorporating Perovskite and Microporous Metala??Organic Framework Nanocrystals for Efficient and Stable Solar Cells
摘要： In this paper, we present a facile approach to enhance the efficiency and stability of perovskite solar cells (PSCs) by incorporating perovskite with microporous indium-based metal–organic framework [In12O(OH)16(H2O)5(btc)6]n (In-BTC) nanocrystals and forming heterojunction light-harvesting layer. The interconnected micropores and terminal oxygen sites of In-BTC allow the preferential crystallization of perovskite inside the regular cavities, endowing the derived films with improved morphology/crystallinity and reduced grain boundaries/defects. Consequently, the In-BTC-modified PSC yields enhanced fill factor of 0.79 and power conversion efficiency (PCE) of 20.87%, surpassing the pristine device (0.76 and 19.52%, respectively). More importantly, over 80% of the original PCE is retained after 12 days of exposure to ambient environment (25 °C and relative humidity of ~ 65%) without encapsulation, while only about 35% is left to the pristine device.
关键词： Light-harvesting layer,Metal–organic framework,Heterojunction,Perovskite solar cell,Nanocrystal
更新于2025-09-23 15:21:01
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Effect of lead thiocyanate ions on performance of tin-based perovskite solar cells
摘要： Perovskite solar cells (PSCs) have a high efficiency, and their price is relatively low; thus, they are attracting considerable attention as a substitute for expensive Si solar cells. However, highly efficient PSCs are not eco-friendly, because they contain toxic metals such as Pb. Therefore, we develop Sn-based PSCs to reduce the Pb content. First, 11 different perovskite precursors are synthesized by increasing the amount of Pb(SCN)2 from 0 to 0.5 M in CH(NH2)2SnI3. Then, PSCs are fabricated, and their characteristics are compared. Scanning electron microscopy confirms that the proper amount of Pb(SCN)2 uniformizes the grain size of the perovskite layer and reduces the amounts of pinholes. The crystallization and optical absorption of each perovskite layer are confirmed by X-ray diffraction analysis and ultraviolet–visible spectra, and the characteristics of the PSCs are confirmed by the current density–voltage graph. The Sn-based PSCs with 0.25 M Pb(SCN)2 exhibit a high efficiency of 8.4%, which is significantly higher than that (1.6%) of Sn-based PSCs without Pb(SCN)2. The calculated Pb concentration of CH3NH3PbI3 is 0.37 g/mL, while that of CH(NH2)2SnI3 containing Pb(SCN)2 is 0.08 g/mL. These results indicate the possibility of producing highly efficient PSCs with reduced lead content.
关键词： Additive,Thiocyanate,Perovskite solar cell
更新于2025-09-23 15:21:01
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Fully Doctor-bladed efficient perovskite solar cells in ambient condition via composition engineering
摘要： It is very meaningful to develop large-scale, low-cost technology for fabricating efficient perovskite solar cells (PSCs) to accelerate their commercialization. Doctor-blading is one of important scalable technologies for processing PSCs, but the power conversion efficiencies (PCEs) of fully doctor-bladed PSCs, including electron transport layer, perovskite layer and hole transport layer, are still lag far behind the PSCs fabricated via conventional spin-coating technology, especially fabricated in ambient condition. Herein, highly efficient planar heterojunction PSCs with a structure of ITO/SnO2/FAxMA(1-x)PbIyBr(3-y)/Spiro-OMeTAD/Ag are achieved by fully doctor-blading technique in ambient condition, in which high-quality perovskite films with low trap-density are fabricated via two-step sequential deposition with a low temperature process by simultaneously introducing composition engineering and additive-doping technology. Organic cation is added into the PbI2 precursor to reduce the uneven distribution of nucleation sites in the perovskite films during doctor-blading process and promote the uniform growth of perovskite grain. Moreover, 2,3,5,6-tetrafluoro-7,7,8,8-tetra-cyanoquinodimethane (F4-TCNQ) acted as the doping additive is employed into perovskite, resulting in healing the perovskite grain boundary and reducing trap-density accordingly. As a result, the doctor-bladed PSCs fabricated in ambient condition exhibit the champion PCE of 18% and a stabilized efficiency of 17.7%. Furthermore, PSCs fabricated via fully doctor-blading in ambient condition achieve the PCE of 17.0% with negligible hysteresis. This work provides an important strategy for scalable fabrication of efficient PSCs in ambient condition and potentially accelerates the commercialization.
关键词： Doctor-blading,Additive,Composition engineering,Perovskite solar cell
更新于2025-09-23 15:21:01
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Enhancement of the thermal properties of heterojunction perovskite solar cells by nanostructured contacts design
摘要： A perovskite solar cell design is structured and analyzed to investigate the thermal behavior of the cell. In order to perform large scale industrial devices, it is required to understand the effect of varying light intensity, ambient temperature and other sources such as joule heating and non-radiative recombination on the module. Subsequently, the enhancement of thermal stability is accomplished by selecting layers that can contribute to the reduction of operating temperature, such as transparent front electrodes and back electrodes. COMSOL Multiphysics is used to structure and simulate a regular planar heterojunction perovskite solar cell with ITO as a transparent front contact and Au as the back contact. These conventional contacts selection resulted in a maximum temperature of 79 °C for all sources of thermalization. Moreover, nine structures combinations are investigated by using FTO, AZO, Ag, and RGO electrodes. It is found that the best thermal structure is the one that utilizes AZO as a transparent contact and RGO as a back contact. This design achieves a huge reduction in the maximum temperature to ~32 °C; with a total of 59.5% thermal reduction when compared to conventional ITO/Au contacts structure.
关键词： Electrodes,COMSOL,Perovskite solar cell,Thermal properties
更新于2025-09-23 15:21:01
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Optimization of CH3NH3PbI3 perovskite solar cells: A theoretical and experimental study
摘要： In this work, an experimental and theoretical study on CH3NH3PbI3 perovskite solar cells was performed. A theoretical validation of experimental results in perovskite solar cells with e?ciencies of 13.32% is presented. An optimization study which involves the spiro-OMeTAD and perovskite thickness’ in?uence on electrical output parameters (Voc, Jsc, FF and PCE) showed a promotion of solar cell e?ciency to 15.50% under 100 nm and 400 nm for hole transport material and absorber, respectively. The importance of the di?usion length of the absorber is discussed. In order to enhance the e?ciency, a study of defect density (NT) was applied at the range of 1016 cm?3 (experimental) to 1010 cm?3 (theoretical) where we achieved an e?ciency of 20.26%. The present work illustrates the importance of thickness optimization and the reduction of defect density (by the improvement of the quality of processed ?lm) to obtain a better performance of this type of solar cell. Furthermore, the relevance of the implementation of a back contact with higher work function was studied.
关键词： SCAPS,Perovskite solar cell,Modeling solar cell,Optimization solar cell
更新于2025-09-23 15:19:57
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Integrated Perovskite/Organic Photovoltaics with Ultrahigh Photocurrent and Photoresponse Approaching 1000a??nm
摘要： To enhance photoresponse of common-used perovskite materials in the near-infrared (NIR) region, a fused-ring electron acceptor (F8IC) with strong NIR absorption and high electron mobility was used to blend with a narrow-bandgap polymer donor (PTB7-Th) to construct organic bulk heterojunction (OBHJ), and this OBHJ was then integrated with the perovskite solar cells. The integrated perovskite/OBHJ solar cells exhibit strong photoresponse approaching 1000 nm and an ultrahigh short-circuit current density of 28.2 mA cm-2, which is much higher than the traditional perovskite solar cells and organic solar cells.
关键词： integrated solar cell,perovskite solar cell,ultrahigh photocurrent,NIR photoresponse,organic solar cell
更新于2025-09-23 15:19:57