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In optimizing perovskites with ionic liquid (IL), the comparative study on Lewis acid‐base (LAB) and hydrogen‐bonding (HB) interactions between IL and perovskite is lacking. Herein, methyl is substituted for hydrogen on 2‐position of imidazolium ring of N‐heterocyclic carbene (NHC) type IL IdH to weaken HB interactions, and the resulting N‐heterocyclic olefin (NHO) type IL IdMe with softer Lewis base...
In recent years, carbon‐based CsPbI2Br perovskite solar cells (PSCs) have attracted more attention due to their low cost and good stability. However, the power conversion efficiency (PCE) of carbon‐based CsPbI2Br PSCs is still no more than 16%, because of the defects in CsPbI2Br or at the interface with the electron transport layer (ETL), as well as the energy level mismatch, which lead to the loss...
Perovskite solar cells (PSCs) have grabbed much attention of researchers owing to their quick rise in power conversion efficiency (PCE). However, long‐term stability remains a hurdle in commercialization, partly due to the inclusion of necessary hygroscopic dopants in hole transporting materials, enhancing the complexity and total cost. Generally, the efforts in designing dopant‐free hole transporting...
All‐inorganic CsPbI3 perovskite solar cells (PSCs) have been extensively studied due to their high thermal stability and unprecedented rise in power conversion efficiency (PCE). Recently, the champion PCE of CsPbI3 PSCs has reached up to 21%; however, it is still much lower than that of organic–inorganic hybrid PSCs. Interface modification to passivate surface defects and minimize charge recombination...
Suppressing defects at the interface between the TiO2 electron transport layer (ETL) and perovskite film is critical for high efficiency and stable perovskite solar cells (PSCs). Herein, a siloxane derivative diethylphosphatoethylsilicic acid (PSiOH) is developed to modify the interface of TiO2 ETL/FA0.83Cs0.17PbI3 perovskite. Comprehensive characteristics reveal that silicon hydroxyl (SiOH) in...
The organic–inorganic halide perovskite solar cell (PerSC) is the state‐of‐the‐art emerging photovoltaic technology. However, the environmental water/moisture and temperature‐induced intrinsic degradation and phase transition of perovskite greatly retard the commercialization process. Herein, a dual‐functional organic ligand, 4,7‐bis((4‐vinylbenzyl)oxy)‐1,10‐phenanthroline (namely, C1), with crosslinkable...
Employing low‐dimensional perovskite has been proven to be a promising approach to enhance the efficiency and stability of perovskite solar cells. Here, thiopheniformamidine hydrochloride is introduced into CH3NH3PbI3‐based printable mesoscopic perovskite solar cells, to form 1D iodide lead thiophenamidine (TFPbI3) in situ. This judiciously designed low‐dimensional perovskite can effectively passivate...
Nowadays, nearly 48.7% near‐infrared (NIR) irradiation (>800 nm) of the full solar spectrum has actually not been fully utilized since the state‐of‐the‐art perovskite film usually can only absorb the most UV–vis sunlight radiation. Herein, high efficiency integrated Cs0.15FA0.85PbI3 perovskite/organic bulk (PC61BM:D18:Y6) heterojunction solar cells with enhanced low energy photon harvest until...
The regulation of perovskite crystallization and nanostructure have revolutionized the development of high‐performance perovskite solar cells (PSCs) in recent years. Yet the problem of stably passivating perovskite surface defects remains perplexing. The 1D perovskites possess superior physical properties compared with bulk crystals, such as excellent moisture stability, self‐healing property, and...
The carrier non‐radiative recombination and instability of device caused by the inherent defects are main factors limiting development of perovskite solar cells (PSCs). During the fabrication process of a PSC device, perovskite films often produce Pb0 and I0 defects. This paper reports a strategy for synergistic optimization of perovskite films by defects passivation and surface modification. The...
Organic‐inorganic metal halide perovskites are regarded as one of the most promising candidates in the photovoltaic field, but simultaneous realization of high efficiency and long‐term stability is still challenging. Here, a one‐step solution‐processing strategy is demonstrated for preparing efficient and stable inverted methylammonium lead iodide (MAPbI3) perovskite solar cells (PSCs) by incorporating...
Semiconducting molecules have been employed to passivate traps extant in the perovskite film for enhancement of perovskite solar cells (PSCs) efficiency and stability. A molecular design strategy to passivate the defects both on the surface and interior of the CH3NH3PbI3 perovskite layer, using two phthalocyanine (Pc) molecules (NP‐SC6‐ZnPc and NP‐SC6‐TiOPc) is demonstrated. The presence of lone electron...
Since Yan's work, incorporation of some lanthanide elements, such as Eu and Nd, into MAPbI3 layer has been proven to be a powerful strategy on improving the permanence of the perovskite solar cells (PSCs). However, a comprehensive configuration has not been given for different lanthanide elements doping while the mechanism has not been clarified. Herein, the incorporation of various lanthanides ions...
Perovskite solar cells (PSCs) have attracted unprecedented attention due to their rapidly rising photoelectric conversion efficiency (PCE). In order to further improve the PCE of PSCs, new possible optimization path needs to be found. Here, quasi‐heteroface PSCs (QHF‐PSCs) is designed by a double‐layer perovskite film. Such brand new PSCs have good carrier separation capabilities, effectively suppress...
MXenes, a newly intriguing family of 2D materials, have recently attracted considerable attention owing to their excellent properties such as high electrical conductivity and mobility, tunable structure, and termination groups. Here, the Ti3C2Tx MXene is incorporated into the perovskite absorber layer for the first time, which aims for efficiency enhancement. Results show that the termination groups...
The power conversion efficiency of perovskite solar cells has been boosted rapidly, it has so far exceeded that of commercial polycrystalline silicon solar cells. This has prompted great interest in large‐scale production and deployment of perovskite solar cells. However, state‐of‐the‐art perovskite solar cells are fabricated inside gloveboxes and further annealing at high temperatures (typically...
Engineering the chemical composition of organic and inorganic hybrid perovskite materials is one of the most feasible methods to boost the efficiency of perovskite solar cells with improved device stability. Among the diverse hybrid perovskite family of ABX3, formamidinium (FA)‐based mixed perovskite (e.g., FA1−xCsxPbI3) possesses optimum bandgaps, superior optoelectronic property, as well as thermal‐...
The microscopic charge transport and recombination processes behind the widely concerned photoelectric hysteresis in the perovskite solar cell have been investigated with both in situ transient photovoltage/photocurrent measurements and the semiconductor device simulation. Time‐dependent behaviors of intensity and direction of the photocurrent and photovoltage are observed under the steady‐state bias...
Alternative low‐temperature solution‐processed hole‐transporting materials (HTMs) without dopant are critical for highly efficient perovskite solar cells (PSCs). Here, two novel small molecule HTMs with linear π‐conjugated structure, 4,4′‐bis(4‐(di‐p‐toyl)aminostyryl)biphenyl (TPASBP) and 1,4′‐bis(4‐(di‐p‐toyl)aminostyryl)benzene (TPASB), are applied as hole‐transporting layer (HTL) by low‐temperature...
Planar heterojunction perovskite solar cells with a high efficiency up to 17.76% are fabricated by modifying the compact TiO2 (c‐TiO2) with a [6,6]‐phenyl‐C61‐butyric acid (PCBA) monolayer. High quality CH3NH3PbI3 films can be easily fabricated on PCBA‐modified c‐TiO2 substrates by a one‐step solution processing method. Significant improvements of the device parameters are observed after PCBA modification...
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