A5071253645- Perovskite Materials and Applications
- Conducting polymers and applications
- Quantum Dots Synthesis And Properties
- Advanced Photocatalysis Techniques
- TiO2 Photocatalysis and Solar Cells
- Chalcogenide Semiconductor Thin Films
- Organic Electronics and Photovoltaics
- Organic Light-Emitting Diodes Research
- Advanced battery technologies research
- Advanced Nanomaterials in Catalysis
- Transition Metal Oxide Nanomaterials
- Solid-state spectroscopy and crystallography
Peking University
2019-2022
Peking University Shenzhen Hospital
2019
Huazhong University of Science and Technology
2011-2017
Wuhan National Laboratory for Optoelectronics
2011-2017
Gratz College
2014-2016
We fabricated a perovskite solar cell that uses double layer of mesoporous TiO2 and ZrO2 as scaffold infiltrated with does not require hole-conducting layer. The was produced by drop-casting solution PbI2, methylammonium (MA) iodide, 5-ammoniumvaleric acid (5-AVA) iodide through porous carbon film. 5-AVA templating created mixed-cation (5-AVA)x(MA)1-xPbI3 crystals lower defect concentration better pore filling well more complete contact the scaffold, resulting in longer exciton lifetime...
A mesoscopic methylammonium lead iodide (CH3NH3PbI3) perovskite/TiO2 heterojunction solar cell is developed with low-cost carbon counter electrode (CE) and full printable process. With black/spheroidal graphite CE, this presents high stability power conversion efficiency of 6.64%, which higher than that the flaky based device comparable to conventional Au version.
By the introduction of an organic silane self-assembled monolayer, interface-engineering approach is demonstrated for hole-conductor-free, fully printable mesoscopic perovskite solar cells based on a carbon counter electrode. The monolayer incorporated between TiO2 and CH3NH3PbI3, resulting in optimized interface band alignments enhanced charge lifetime. average power conversion efficiency improved from 9.6% to 11.7%, with highest 12.7%, this low-cost cell.
A hole-conductor-free fully printable mesoscopic TiO2/CH3NH3PbI3 heterojunction solar cell was developed with TiO2 nanosheets containing high levels of exposed (001) facets. The embodiment employed a double layer mesoporous and ZrO2 as scaffold infiltrated by perovskite light harvester. No hole conductor or Au reflector employed. Instead, the back contact simply carbon layer. from solution through porous reactivity facets in improved interfacial properties between electron collector. As...
Mesoporous graphite/carbon black counter electrodes (CEs) using flaky graphite with different sizes were applied in hole-conductor-free mesoscopic perovskite solar cells by a screen-printing technique. Conductivity measurements, current–voltage characteristics, and impedance spectroscopy measurements carried out to study the influence of CEs on photovoltaic performance devices. The results indicated that graphite, which acted as conductor carbon (CCEs), could significantly affect square...
Formamidinium lead trihalide perovskite (FAPbI<sub>3</sub>) was successfully introduced into hole-conductor-free, fully printable mesoscopic solar cells with a carbon counter electrode.
Mixed-anion perovskite CH3NH3PbI(3−x)(BF4)x has been developed and optimized to enable a highly efficient hole-conductor-free fully printable mesoscopic solar cell. The employment of BF4− in hybrid organic–inorganic halide significantly improves its optical electric properties, such as light harvesting ability, carrier concentration, conductivity, leading an enhanced power conversion efficiency 13.24%. As service our authors readers, this journal provides supporting information supplied by...
The size effect of the TiO2 photoanode has been investigated on hole-conductor-free fully printable mesoscopic perovskite solar cells based carbon counter electrode and (5-AVA)x(MA)1−xPbI3 perovskite. With nanoparticles with an optimized diameter 25 nm, a champion device exhibits efficiency 13.41%.
Highly ordered mesoporous carbon (OMC) with well-connected frameworks was applied in mesoscopic CH3NH3PbI3/TiO2 heterojunction solar cells as counter electrode. The OMC were synthesized by a template method and mixed flaky graphite to prepare the paste, which used fabricate electrode screen-printing technology. based cell presented fill factor (FF) of 0.63 power conversion efficiency (η) 7.02%, remarkable improvement compared black device. electrochemical impedance spectrum measurement...
Simplifying the process of fine-tuning electronic and optical properties graphene oxide (GO) is importance in order to fully utilize it as hole interfacial layer (HIL). We introduced silver trifluoromethanesulfonate (AgOTf), an inorganic chemical dopant, that tunes controls single-layered GO films synthesized by vapor deposition. The morphology, work function, mobility, sheet resistance, transmittance film were systematically tuned various doping concentrations. further developed a...
We report perovskite solar cells with a new device structure that employ highly conductive polymer poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PSS) as the top electrode replacing commonly used metal electrodes. ThePSS is prepared from its aqueous solution through transfer-lamination technique rather than direct spin-coating, which converts CH(3)NH(3)PbI(3) into PbI(2). Perovskite of glass/FTO/c-TiO(2)/m-TiO(2)/CH(3)NH(3)PbI(3)/spiro-OMeTAD/PEDOT:PSS yield maximum open-circuit...
Abstract Post‐treatment is a widely used strategy to reduce defects in perovskite films, but has been largely limited the solution phase. Herein, posttreatment tool kit and develop universal amine salts (A I X ) vapor healing by taking advantage of penetrating power soft‐matter characteristics halide expanded. In striking demonstration, post‐treatment pristine layers allows simultaneous filling MA + – vacancies, passivation both cation anion defects, films high order crystallinity required...
The interface between the perovskite layer and carbon electrode is important for printable carbon‐based solar cells (PSCs) to improve power conversion efficiency (PCE) device stability. A series of acetate salts are employed in situ post‐modify PSCs by post‐treatment method. Cesium (CsAc) identified enhance average PCE from 12.6% 15.3%. stabilized output reaches 15.6%, highest open‐circuit voltage ( V OC ) 1.1 V, representing a new milestone increasing ratio / E g : bandgap perovskite) be...
A new thiolate/disulfide mediator was designed and synthesized by employing DFT calculations as a guide. It possesses high transparency to visible light, very attractive feature for bifacially active transparent DSCs that require highly counter electrode (CE). Compared the reported most promising T(-)/T(2), this analogous produced major enhancement in open circuit potential (V(OC)) about 40 mV correspondingly higher power conversion efficiency (η) DSCs. Furthermore, uniform (transmittance >...
Abstract A mesoscopic nitrogen-doped TiO 2 sphere has been developed for a quasi-solid-state dye-sensitized solar cell [DSSC]. Compared with the undoped sphere, DSSC based on shows more excellent photovoltaic performance. The photoelectrochemistry of electrodes and spheres was characterized Mott-Schottky analysis, intensity modulated photocurrent spectroscopy, electrochemical impedance which indicated that both quasi-Fermi level charge transport photoelectrode were improved after being doped...
A poly(ionic liquid) (PIL), poly(1-alkyl-3-vinylimidazolium iodide), was synthesized and employed to prepare a quasi-solid-state electrolyte for dye-sensitized solar cells. The PIL functioned as the charge transfer intermediate, source of redox couple also gelator in electrolyte. Assembled with this carbon counter electrode, power conversion efficiency 6.18% obtained.
Highly dispersible TiO<sub>2</sub>@ZrO<sub>2</sub> nanoparticles are synthesized to prepare an ultra-flat and crack-free spacer film, leading enhanced insulating ability compared a conventional spacer.
Thiocyanate anion (SCN–) can coordinate to solid surfaces in various coordination modes, endowing the with different structures and electronic catalytic properties, but rules that dictate preference are poorly understood due multiple sites of both SCN– as well SCN–-lattice mismatch. In this article, extensive density functional theory calculations performed study modes on some selected surfaces. particular, influence surface stress, coverage, counter cations is discussed at length. It found...
The spacer layer is a key component of fully printable mesoscopic perovskite solar cells, but its precise characteristics are far from being understood in relation to the device design. In present work, we perform detailed systematic study on effects parameters, such as size building blocks, thickness, etc., properties filler, insulating ability and performance cells by combining techniques time-resolved photoluminescence, high-resolution TEM, resistance measurements, impedance spectroscopy...