- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
25.1% Higha??Efficient Monolithic Perovskite Silicon Tandem Solar Cell with a High Band Gap Perovskite Absorber
摘要： Monolithic perovskite silicon tandem solar cells can overcome the theoretical efficiency limit of silicon solar cells. This requires an optimum band gap, high quantum efficiency, and high stability of the perovskite. Here, we combine a silicon heterojunction bottom cell with a perovskite top cell with an optimum band gap of 1.68 eV in planar p-i-n tandem configuration. Methylammonium-free FA0.75Cs0.25Pb(I0.8Br0.2)3 perovskite with high Cs-content is investigated for improved stability. A 10% molarity increase to 1.1 M of the perovskite precursor solution resulted in ~75 nm thicker absorber layers and 0.7 mA/cm2 higher short-circuit current density. With the optimized absorber, tandem devices reach a high fill factor of ~80% and up to 25.1% certified efficiency. The unencapsulated tandem device shows an efficiency improvement of 2.3% (absolute) over five months showing the robustness of the absorber against degradation. Moreover, a photoluminescence quantum yield analysis reveals that with adapted charge transport materials and surface passivation, along with improved anti-reflection measures, the high band gap perovskite absorber has the potential for 30% tandem efficiency in the near future.
关键词： interfaces,heterojunction silicon solar cells,perovskite solar cells,thin films,tandem solar cells
更新于2025-09-23 15:21:01
-
Transparent Electrodes Consisting of a Surface-Treated Buffer Layer Based on Tungsten Oxide for Semitransparent Perovskite Solar Cells and Four-Terminal Tandem Applications
摘要： For semitransparent devices with n-i-p structures, a metal oxide buffer material is commonly used to protect the organic hole transporting layer from damage due to sputtering of the transparent conducting oxide. Here, a surface treatment approach is addressed for tungsten oxide-based transparent electrodes through slight modification of the tungsten oxide surface with niobium oxide. Incorporation of this transparent electrode technique to the protective buffer layer significantly recovers the fill factor from 70.4% to 80.3%, approaching fill factor values of conventional opaque devices, which results in power conversion efficiencies over 18% for the semitransparent perovskite solar cells. Application of this approach to a four-terminal tandem configuration with a silicon bottom cell is demonstrated.
关键词： semitransparent solar cells,perovskite-silicon tandem,niobium oxide,tungsten oxide,perovskite solar cells
更新于2025-09-23 15:21:01
-
Unraveling the impact of hole transport materials on photostability of perovskite films and p-i-n solar cells
摘要： We investigated the impact of a series of hole transport layer materials (HTLs) such as PEDOT:PSS, NiOx, PTAA, and PTA on photostability of thin films and solar cells based on MAPbI3, Cs0.15FA0.85PbI3, Cs0.1MA0.15FA0.75PbI3, Cs0.1MA0.15FA0.75Pb(Br0.15I0.85)3, and Cs0.15FA0.85Pb(Br0.15I0.85)3 complex lead halides. Mixed halide perovskites showed reduced photostability in comparison with similar iodide-only compositions. In particular, we observed light-induced recrystallization of all perovskite films except MAPbI3 with the strongest effects revealed for Br-containing systems. Moreover, halide and β FAPbI3 phase segregations were also observed mostly in mixed-halide systems. Interestingly, coating perovskite films with PCBM layer spectacularly suppressed light-induced growth of crystalline domains as well as segregation of Br-rich and I-rich phases or β FAPbI3. We strongly believe that all three effects are promoted by the light-induced formation of surface defects, which are healed by adjacent PCBM coating. While comparing different hole-transport materials, we found that NiOx and PEDOT:PSS are the least suitable HTLs due to their interfacial (photo)chemical interactions with perovskite absorbers. On the contrary, polyarylamine-type HTLs PTA and PTAA form rather stable interfaces, which makes them the best candidates for durable p-i-n perovskite solar cells. Indeed, multilayered ITO/PTA(A)/MAPbI3/PCBM stacks revealed no aging effects within 1000 h of continuous light soaking and delivered stable and high power conversion efficiencies in solar cells. The obtained results suggest that using polyarylamine-type HTLs and simple single-phase perovskite compositions paves a way for designing stable and efficient perovskite solar cells.
关键词： stable HTL/perovskite interface,interface-induced degradation,light-induced perovskite crystallization,photo-induced degradation,p-i-n perovskite solar cells
更新于2025-09-23 15:21:01
-
Suppressing Shallow Defect of Printable Mesoscopic Perovskite Solar Cells with a N719@TiO <sub/>2</sub> Inorganic-Organic Core-Shell Structured Additive
摘要： Shallow defects are one of the energy states that trap photoexcited electrons leading to charge recombination and limit the increase in the photocurrent of perovskite solar cells (PSCs). Due to the large perovskite thickness and uncontrollable crystallization processes, suppressing shallow defects, especially methylamine (MA) vacancies, has become a key challenge for fully printable PSCs. Herein, nano-TiO2 is unprecedentedly used to load the commercial dye N719, forming N719@TiO2 nanoparticles, which crucially improves the passivation effect of MA vacancies on the surface of perovskite and charge extraction, by the unbounded carboxyl group of N719 as a shell on the surface of TiO2. Meanwhile, the core TiO2 serves as a centre to bind the dyes, assisting the perovskite crystallization and enhancing the passivation effect. It is found that the charge extraction increases to 1.8007 (cid:1) 10 N719@TiO2 from 1.5507 (cid:1) 10 short-circuit current density (Jsc) is signi?cantly enhanced to 23.58 mA cm in the device containing N719@TiO2 over that of the control device (21.95 mA cm PSCs via organic passivator with carboxyl anchoring group loaded on n-type semiconductors (nano-TiO2).
关键词： passivation,printable solar cells,dyes,titanium dioxide,perovskite solar cells
更新于2025-09-23 15:21:01
-
Universal Elaboration of Al-Doped TiO <sub/>2</sub> as an Electron Extraction Layer in Inorganic-Organic Hybrid Perovskite and Organic Solar Cells
摘要： Fabricating an electron extraction layer (EEL) with a metal doping transition metal oxide (TMO) in inorganic–organic hybrid perovskite solar cells (PeSCs) and organic solar cells (OSCs) is a simple and efficient process for enhancing photovoltaic properties. Here, the universal benefits and common factors that influence both PeSCs and OSCs as a result of changes in Al-doped TiO2 properties are investigated. These common factors are identified in two separate mechanisms. The first involves surface smoothing of TiO2 films, which affects the formation of a high crystalline active layer and reduces recombination between the electron extraction and active layers. The second involves bandgap widening of TiO2, which reduces the activation energy and enhances the quenching efficiency of devices. These factors are demonstrated in various measurements. The results will help in understanding the fundamental benefits of Al-doped TiO2 in solution-processed thin-film solar cells.
关键词： perovskite solar cells,electron extraction layer,organic solar cells,Al-doped TiO2
更新于2025-09-23 15:21:01
-
Beyond Perovskite Solar Cells: Tellurium Iodide as a Promising Lighta??Absorbing Material for Solutiona??Processed Photovoltaic Application
摘要： Searching new light-absorbing materials to replace toxic lead halide in solar cells is very important and highly desirable. In this research, we firstly demonstrated that tellurium iodide (TeI4) could be used as a light-absorbing material in solar cells due to its suitable optical band gap and the active lone-pair electron orbital in Te4 +. The best power conversion efficiency (PCE = 3.56%) was achieved with a concentration of 0.9 M TeI4 in DMF:DMSO (4 : 1, v,v) without any heat treatment or antisolvent dripping. Our study indicates the promising potential of TeI4 for photovoltaic and optoelectronic applications.
关键词： beyond perovskite solar cells,non-toxic light absorber,lead-free solar cells,TeI4
更新于2025-09-23 15:21:01
-
Inkjeta??Printed TiO <sub/>2</sub> /Fullerene Composite Films for Planar Perovskite Solar Cells
摘要： Perovskite solar cells have garnered and held international research interest, due to ever-climbing power conversion efficiency values, now >25%. Some high efficiency configurations utilize a compact TiO2 layer underneath a mesoporous TiO2 layer, both of which require high temperature annealing steps that could hinder perovskite commercialization. To address the high thermal budget, we chose to use inkjet-printing to combine the two layers into a single TiO2 film, which incorporates both nanoparticle and molecular precursor as well as organic fullerene additives. We printed the ink on fluorine-doped tin oxide, and after annealing at various temperatures, we found that 400°C was the optimum annealing temperature for the inkjet-printed electron transport layers, which is significantly lower than the 500°C required to anneal typical mesoporous TiO2 films.
关键词： composite transport layer,inkjet printing,perovskite solar cells,solar cells
更新于2025-09-23 15:21:01
-
Enhanced stability of ?±-phase FAPbI3 perovskite solar cells by insertion of 2D (PEA)2PbI4 nanosheets
摘要： Methylammonium (MA) is one of the main obstacles that hold back the commercialization of perovskite solar cells (PSCs). Formamidinium (FA)-based perovskite is a promising photovoltaic material for its higher thermal stability and smaller bandgap. However, despite the introduction of Cs+ in FAPbI3, the photoactive α-phase FAPbI3 can quickly transform into a non-perovskite hexagon phase δ-FAPbI3, which limits its use in perovskite solar cell. In this work, we show the dispersed of 2D (PEA)2PbI4 nanosheets into the Cs0.1FA0.9PbI3 thin film successfully prevents the transformation of the α-phase Cs0.1FA0.9PbI3 to the δ-phase. Because of the 2D (PEA)2PbI4 nanosheets, higher quality perovskite thin-film was obtained with longer carrier lifetime, lower trap state density, and enhanced stability. The resulting device reaches a high power conversion efficiency of 20.44%, which is one of the highest for MA-free perovskites and retains 82% of their initial efficiency after 800 h aging study.
关键词： power conversion efficiency,2D perovskite nanosheets,formamidinium,stability,perovskite solar cells
更新于2025-09-23 15:21:01
-
From metallic lead films to perovskite solar cells through lead conversion with polyhalides solutions
摘要： Solutions of methylammonium and formamidinium polyhalides (AX1+n, A = MA, FA, X = I, Br) in isopropanol are introduced as a novel versatile precursor for the fabrication of APbX3 hybrid perovskite thin films via oxidation of metallic Pb. The polyhalides solution with adjustable reactivity is distributed over metallic Pb layer followed by an iodine vapor post-processing to tune the morphology and composition of the film using only the elements inherently present in the perovskite. This method is easily reproducible in any materials science laboratory with an equipment commonly used for perovskite solar cells fabrication and resulted in 16.2% and 17.2% PCE of planar solar cells using MAPbI3 and MA0.25FA0.75PbI2.75Br0.25 perovskites as a proof-of-concept. Implementation of metallic lead thin films as a single Pb-containing precursor reduces a number of in-lab handling hazards compared to classical PbI2 powder and solutions, and provides a variety of scalable deposition options.
关键词： Polyhalides,iodine vapor,metallic lead,perovskite solar cells,perovskite fabrication
更新于2025-09-23 15:21:01
-
A Thermally Induced Perovskite Crystal Control Strategy for Efficient and Photostable Widea??Bandgap Perovskite Solar Cells
摘要： Wide-bandgap perovskite solar cells (WBG PSCs) have gained attention as promising tandem partners for silicon solar cells due to their complementary absorption, superb open-circuit voltage, and easy solution process. Recently, both their performance and stability have been improved by compositional-engineering or defect-passivation strategies, due to modulation of perovskite crystal size and reduction of crystal defects. In this work, we report a thermally induced phase control (TIPC) strategy, which enables efficient and photostable WBG PSCs without any compositional engineering by exploring a thermal annealing process window of WBG perovskite films for the annealing temperature and time range of 100-175°C and 3-60 minutes, respectively. Within this window, we found a key annealing regime that produces preferred crystal orientations of lead iodide and the WBG perovskite, suppressing phase segregation and reducing charge recombination in the perovskites. The WBG PSC (composition of FA0.75MA0.15Cs0.1PbI2Br and Eg of 1.73 eV) optimized by TIPC exhibited an excellent power conversion efficiency (PCE) of 18.60% and improved operational stability, maintaining >90% of the maximum PCE (during maximum power point tracking) without encapsulation after 12-hour operation under AM 1.5G irradiation in ambient air conditions and after 500-hour operation under white LED irradiation (100 mW cm-2) in inert N2 gas conditions.
关键词： wide-band gap perovskite,thermal annealing process,operational stability,perovskite solar cells,invariant bandgap
更新于2025-09-23 15:21:01