- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
??a??Extended Spiro Corea??Based Nonfullerene Electrona??Transporting Material for Higha??Performance Perovskite Solar Cells
摘要： Electron transport materials (ETMs) play a significant role in perovskite solar cells (PSCs). However, conventional solution processable organic ETMs are mainly restricted to fullerene derivatives and it is challenging to obtain nonfullerene ETMs with satisfactory properties. In this work, a new organic semiconductor SPS-4F is synthesized by utilizing the classical spiro[fluorine-9′9-thioxanthene] unit to construct a π-extended core. Although spiro is normally used in hole transport materials, the new spiro derivative SPS-4F is successfully used as an ETM in inverted PSCs with power conversion efficiency over 20%. In addition, SPS-4F can strongly coordinate with MAPbI3 perovskite and lead to efficient surface trap passivation. The resultant PSCs exhibit excellent stability in air because of the hydrophobic property of SPS-4F. This work opens up opportunities to obtain a new family of ETMs based on spiro and paves a way to the fabrication of high-performance PSCs with low cost.
关键词： spiro derivatives,perovskite solar cells,nonfullerenes,passivation,electron transport materials
更新于2025-09-23 15:21:01
-
Potassium Induced Phase Stability Enables Stable and Efficient Widea??Bandgap Perovskite Solar Cells
摘要： The incorporation of potassium can remarkably stabilize wide-bandgap perovskites with a high Br content by the synergistic effect of the formation of 2D K2PbI4 at the grain boundaries and the interstitial occupancy in the perovskite lattices, which can effectively reduce the trap density and inhibit ion migration, thus suppressing the nonradiative recombination and photoinduced phase segregation.
关键词： phase segregation,wide-bandgap perovskite solar cells,potassium incorporation,defect passivation
更新于2025-09-23 15:21:01
-
Indenea??C <sub/>60</sub> Bisadduct Electron Transporting Material with the High LUMO Level Enhances Open-Circuit Voltage and Efficiency of Tin-Based Perovskite Solar Cells
摘要： Tin-based halide perovskite materials are promising eco-friendly light absorbers with similar optoelectronic properties to lead-based ones. However, their solar cells have suffered from considerably low open-circuit voltage (VOC) arising from mismatched energy levels between tin-based perovskite and charge-transporting layers because they imitate typical device structures developed for lead-based ones. Herein we report the unoccupied molecular orbital (LUMO) level of electron transporting layer (ETL) significantly affects VOC of tin-based perovskite solar cells (PSCs) in contrast to lead-based ones. The indene?C60 bisadduct (ICBA) ETL with the much higher LUMO level than typical ETLs decreases an energy off-set with the conduction band minimum of mixed formamidinium/phenylethylammonium tin iodide (FA0.9PEA0.1SnI3)-based perovskite material. The resultantly reduced VOC loss at their interface gives a VOC of 0.651 V, the highest to date for FASnI3-based PSCs. An achieved champion PCEs reaches 7.05%. This result highlights the importance of redesigning device structures dedicated to tin-based PSCs.
关键词： open-circuit voltage,electron transportation,perovskite solar cells,lead-free,tin
更新于2025-09-23 15:21:01
-
Efficient All-Inorganic CsPbBr <sub/>3</sub> Perovskite Solar Cells by Using CdS/CdSe/CdS Quantum Dots as Intermediate Layers
摘要： Highly e?cient all-inorganic perovskite solar cells require a fast charge transfer from CsPbBr3 to TiO2 to reduce the recombination from trap states. Herein, we insert a CdS/CdSe/CdS quantum dot (QD) layer between the TiO2 and CsPbBr3 layers to fabricate all-inorganic perovskite solar cells. By tuning the thicknesses of the CdSe layer of CdS/CdSe/CdS QDs, the conduction band (CB) levels can be adjusted to -3.72~-3.87 eV. After inserting the QD intermediate layer, the energy o?set between the CB of TiO2 and CsPbBr3 is reduced, thus leading to a charge transfer rate boost from 0:040 × 109 to 0:059 × 109 s?1. The power conversion e?ciency (PCE) of the solar cell with QD intermediate layer achieves 8.64%, which is 20% higher than its counterpart without QDs.
关键词： CdS/CdSe/CdS quantum dots,power conversion efficiency,charge transfer,all-inorganic perovskite solar cells
更新于2025-09-23 15:21:01
-
NiO/Perovskite Heterojunction Contact Engineering for Highly Efficient and Stable Perovskite Solar Cells
摘要： Recent research shows that the interface state in perovskite solar cells is the main factor which affects the stability and performance of the device, and interface engineering including strain engineering is an effective method to solve this issue. In this work, a CsBr buffer layer is inserted between NiOx hole transport layer and perovskite layer to relieve the lattice mismatch induced interface stress and induce more ordered crystal growth. The experimental and theoretical results show that the addition of the CsBr buffer layer optimizes the interface between the perovskite absorber layer and the NiOx hole transport layer, reduces interface defects and traps, and enhances the hole extraction/transfer. The experimental results show that the power conversion efficiency of optimal device reaches up to 19.7% which is significantly higher than the efficiency of the device without the CsBr buffer layer. Meanwhile, the device stability is also improved. This work provides a deep understanding of the NiOx/perovskite interface and provides a new strategy for interface optimization.
关键词： lattice mismatches,buffer layers,NiO,contact engineering,perovskite solar cells
更新于2025-09-23 15:21:01
-
Enabling selective absorption in perovskite solar cells for refractometric sensing of gases
摘要： perovskite solar cells are currently considered a promising technology for solar energy harvesting. their capability to deliver an electrical signal when illuminated can sense changes in environmental parameters. We have numerically analyzed the variation of the current delivered by a perovskite cell as a function of the index of refraction of air, that is in contact with the front surface of the cell. This calculation identifies which geometrical and material structures enhance this behavior. After replacing the top transparent electrode of a solar cell by an optimized subwavelength metallic grating, we find a large variation in the responsivity of the cell with respect to the change in the index of refraction of the surrounding medium. Such a refractometric sensor can be interrogated electronically, avoiding the cumbersome set-ups of spectral or angular interrogation methods. We present an adaptation of the performance parameters of refractometric sensors (sensitivity and figure of merit) to the case of opto-electronic interrogation methods. the values of sensitivity and figure of Merit are promising for the development of refractometric perovskite-based sensors.
关键词： gas sensing,optical sensor,perovskite solar cells,nanophotonic structures,refractometric sensing
更新于2025-09-23 15:21:01
-
Extrinsic Ion Distribution Induced Field Effect in CsPbIBr <sub/>2</sub> Perovskite Solar Cells
摘要： Excellent power conversion efficiency (PCE) and stability are the primary forces that propel the all-inorganic cesium-based halide perovskite solar cells (PSCs) toward commercialization. However, the intrinsic high density of trap state and internal nonradiative recombination of CsPbIBr2 perovskite film are the barriers that limit its development. In the present study, a facile additive strategy is introduced to fabricate highly efficient CsPbIBr2 PSCs by incorporating sulfamic acid sodium salt (SAS) into the perovskite layer. The additive can control the crystallization behaviors and optimize morphology, as well as effectively passivate defects in the bulk perovskite film, thereby resulting in a high-quality perovskite. In addition, SAS in perovskite has possibly introduced an additional internal electric field effect that favors electron transport and injection due to inhomogeneous ion distribution. A champion PCE of 10.57% (steady-output efficiency is 9.99%) is achieved under 1 Sun illumination, which surpasses that of the contrast sample by 16.84%. The modified perovskite film also exhibits improved moisture stability. The unencapsulated device maintains over 80% initial PCE after aging for 198 h in air. The results provide a suitable additive for inorganic perovskite and introduce a new conjecture to explain the function of additives in PSCs more rationally.
关键词： sulfamic acid sodium,additive engineering,inorganic perovskites,perovskite solar cells,moisture stability
更新于2025-09-23 15:21:01
-
Effect of Interfacial Layers on the Device Lifetime of Perovskite Solar Cells
摘要： Organic–inorganic hybrid perovskites have excellent optical and electronic properties; exploitation of these traits has increased the power conversion efficiency of perovskite photovoltaics (PePVs) to 25.2%. However, perovskites are chemically unstable, and this deficit has critically impeded their commercialization. Device degradation occurs at the interfaces of PePVs with multiple degradation mechanisms: decomposition of organic cations in perovskites; generation of inorganic byproducts in perovskites; superoxide or trap sites at the interface of the charge-transport layer; excess charge carriers in perovskites; interfacial migration between perovskites and electrodes. This review considers the critical functions of the interfacial materials to overcome the various degradation at the interfaces of the PePVs. The working mechanisms stabilizing the interface of PePVs are categorized: passivation from atmosphere; inactivation of defect states; migration-blocking. Then, the outstanding interfacial layers made of organic materials (defect passivation, physical robustness, and chemical inactivation) and inorganic materials (chemically passivating metal oxide, physically passivating metal oxide, and low-temperature processed inorganic materials) are reviewed according to the stabilizing mechanisms. In addition, the influences of inorganic interconnecting layers in tandem PePVs are reviewed, with respect of various effects of interfacial buffer materials at the interface with perovskites.
关键词： device lifetime,interfacial layers,perovskite solar cells,stability,degradation mechanisms
更新于2025-09-23 15:21:01
-
Nona??Conjugated Polymer Based on Polyethylene Backbone as Dopanta??Free Holea??Transporting Material for Efficient and Stable Inverted Quasia??2D Perovskite Solar Cells
摘要： Novel non-conjugated polymer based on polyethylene backbone, PVCz-OMeTPA with suitable energy levels, good hole mobility as well as excellent film-forming ability assisting the formation of high-quality perovskite films, is developed as efficient dopant-free hole-transporting materials (HTMs) for inverted quasi-2D perovskite solar cells (PSCs). Quasi-2D PSCs using ultra-thin, dopant-free PVCz-OMeTPA as HTM exhibited excellent power conversion efficiency of 17.22% and long-term environmental stability.
关键词： low-cost,quasi-2D perovskite solar cells,main-chain non-conjugated polymer,dopant-free hole-transporting materials
更新于2025-09-23 15:21:01
-
Decoupling Contributions of Chargea??Transport Interlayers to Lighta??Induced Degradation of pa??ia??n Perovskite Solar Cells
摘要： Perovskite solar cells (PSCs) have demonstrated impressive performance, while their operation stability still requires substantial improvements before this technology can be successfully commercialized. There is a growing evidence that stability of PSCs is strongly dependent on the interface chemistry between the absorber films and adjacent charge transport layers, while the exact mechanistic pathways remain poorly understood. Here we present a systematic approach for decoupling the degradation effects induced by the top electron transport layer (ETL) of the fullerene derivative PC61BM and various bottom hole-transport layer (HTL) materials assembled in p-i-n perovskite solar cells configurations. We show that chemical interaction of MAPbI3 absorber with PC61BM most aggressively affects the operation stability of solar cells. However, washing away the degraded fullerene derivative and depositing fresh ETL leads to restoration of the initial photovoltaic performance when bottom perovskite/HTL interface is not degraded. Following this approach and refreshing ETL after light soaking of the samples and before completing the solar cell architectures, we were able to compare the photostability of stacks with various HTLs. It has been shown that PEDOT:PSS and NiOx induce significant degradation of the adjacent perovskite layer under light exposure, while PTAA provides the most stable perovskite/HTL interface. ToF-SIMS analysis of fresh and aged samples allowed us to identify chemical origins of the interactions between MAPbI3 and HTLs. The proposed research methodology and the revealed degradation pathways should facilitate future development of efficient and stable perovskite solar cells.
关键词： hole transporting materials,perovskite solar cells,TOF-SIMS,stability,interfacial degradation
更新于2025-09-23 15:21:01