Incorporating a Polar Molecule to Passivate Defects for Perovskite Solar Cells

Liu, Chunyu; Zhang, Dezhong; Li, Zhuowei; Han, Wenbin; Ren, Guanhua; Li, Zhiqi; Shen, Liang; Guo, Wenbin; Zheng, Weitao

doi:10.1002/solr.201900489

Cited by 20 publications

(21 citation statements)

References 35 publications

(41 reference statements)

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“…The lower peak at 530.1 eV referred to bonding oxygen atoms, while the higher peak at 531.5 eV related to oxygen vacancies and other oxygen‐deficient defects. [ 34,44,45 ] The intensity of the higher O 1 s peak of the control group is equivalent to that of the lower O 1 s peak, which confirms that there are many oxygen defects such as hydroxyl groups on the surface of pristine ZnO layer. After modification, the intensity of higher O 1 s peak significantly reduced, suggesting the reduction of oxygen‐deficient defects.…”

Section: Resultsmentioning

confidence: 73%

“…[23,40] Low-temperature preparation is also a great advantage of zinc oxide, which allows ZnO to be applied to flexible substrates. However, the surface of zinc oxide prepared at low temperature often has a lot of defects, [34,42,43] hampering the charge transport through the interface and the stability of the device. The most typical defects are oxygen defects such as hydroxyl groups on the surface.…”

Section: Resultsmentioning

confidence: 99%

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Bottom Interfacial Engineering for Methylammonium‐Free Regular‐Structure Planar Perovskite Solar Cells over 21%

Leng

Wang

et al. 2021

Solar RRL

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Formamidinium cesium (FACs) perovskite solar cells (PSCs) with the exclusion of methylammonium (MA) cations often have greatly improved device stability; however, their inferior performance compared with MA‐based devices has impeded the real application. Among various device engineering strategies, bottom interfacial engineering is a promising method to simultaneously achieve the passivation of interfacial defects and the crystallization control of perovskite. Herein, a simple and effective bottom interfacial design is presented to improve the efficiency and stability of FACs PSCs by capping o‐phenanthroline derivatives on the ZnO electron transporting layer (ETL). The most efficient modifier, 4,7‐Dichloro‐1,10‐phenanthroline (Cl‐phen), can improve the crystallinity of the perovskite film by chlorinated surface and passivate the defects of ZnO by reducing surface hydroxyl groups and oxygen vacancies. In addition, Cl‐phen modified ZnO shows better energy alignment with FACs perovskite and increases the built‐in electric field cascade by 80 mV. As a result, a champion device efficiency of 21.15% is obtained using ZnO/Cl‐phen bilayer ETL. The stability has also been improved using ZnO/Cl‐phen bilayer ETL, in which 91.5% of initial PCE is retained after 1500 h of storage at ambient environment (RH: 40–50%) without encapsulation.

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Section: Resultsmentioning

confidence: 73%

Section: Resultsmentioning

confidence: 99%

Bottom Interfacial Engineering for Methylammonium‐Free Regular‐Structure Planar Perovskite Solar Cells over 21%

Leng

Wang

et al. 2021

Solar RRL

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“…[ 162 ] The extraction of electrons and holes originates at the ETL/PSK and the HTL/PSK interfaces, and the charge transport through the heterointerfaces of CTL/PSK is doomed to cause charge loss due to defects at the heterointerfaces. [ 163,164 ] With regard to the common spin‐coating method, the CTLs at the bottom of perovskite layers have an extraordinary effect on the crystallization of perovskite, whereas the CTLs at the top of perovskite layers directly contact the grain boundaries and dangling bonds on the surface of perovskite. [ 165 ] Due to their promising designability, graphene‐based interlayers have emerged as viable options for defect passivation at the interface between CTLs and PSKs.…”

Section: Application Of Graphene In Interfacesmentioning

confidence: 99%

Graphene‐Based Materials in Planar Perovskite Solar Cells

et al. 2020

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Metal halide perovskite solar cells (PSCs) have recently become the most promising new‐generation solar cells, with a breathtaking growth of efficiency from 3.8% to 25.2% in just one decade. Scientists have abandoned the traditional high‐temperature‐processed mesoscopic layer of the initial mesoscopic PSCs in designing and manufacturing planar PSCs. This new feature endows planar PSCs with possibilities of low‐temperature processibility and large‐scale production. Nevertheless, the advancement of planar PSCs remains limited by two bottlenecks: charge loss and device degradation. To address these two issues, researchers have adopted graphene‐based materials, which demonstrate tremendous potentials due to their superb optical transparency, outstanding carrier mobility, remarkable electrical conductivity, and superior physicochemical stability. Defects inside films and at interfaces are regulated by graphene, thereby contributing to more efficient charge extraction and suppressed charge recombination. The graphene protective layer enhances the moisture and heat stability of planar PSCs, thereby extending the lifetime of devices. Herein, the typical synthesis methods of graphene and the recent applications of graphene in planar PSCs are summarized and discussed. Furthermore, concluding perspectives on current challenges and the future development of graphene in planar PSCs are proposed.

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“…CNDs help to reduce the microstrain of the MHP thin film and modify the surface wettability to improve the crystalline quality of the MHP thin film. [ 239 ] Carbon QDs (CQDs) have also been successfully integrated with MHP‐based photovoltaics to improve optoelectronic performance. [ 240–242 ] Furthermore, the functional groups in CQDs, such as carboxyl, hydroxyl, and amino groups, can interact with Pb atoms and the CQDs can also act as nucleation centers to improve the surface quality of the MAPbI 3 film.…”

Section: Challenges and Perspectivesmentioning

confidence: 99%

Carbon Nanomaterials for Halide Perovskites‐Based Hybrid Photodetectors

Howlader

Zheng

2020

Adv Materials Technologies

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optoelectronic devices, including photodetection devices, have been dominated by inorganic semiconductors. However, the high cost, complex fabrication techniques, and lack of mechanical flexibility have limited mass production and integration of these established mature inorganic semiconductor-based photodetectors with novel technologies. Some organic semiconductor-based photodetection devices have also been reported. The low-cost fabrication process, low-temperature solution-based preparation, ease of largearea production, lightweight, and mechanical flexibility make them strong competitors to inorganic semiconductors. However, organic semiconductor-based photodetectors have some major drawbacks, such as much slower operation and a limited life span compared with inorganic-based photodetectors. [6-8] In this regard, a new semiconducting material class known as metal halide perovskites (MHPs) has emerged as a possible alternative to inorganic and organic semiconductors. These MHP semiconductors have opened a new door in the field of optoelectronics. In particular, outstanding photoconversion efficiency of about 24% has been achieved for MHP-based photovoltaic devices within a decade of their introduction to photovoltaics. [9] This rapid achievement has encouraged many researchers to investigate new optoelectronic device applications beyond photovoltaics. Among these applications, the development of MHPbased photodetection devices is regarded as a new research hotspot. Importantly, MHPs have large absorption coefficients as high as 10 5 cm −1 , [10] which is one of the basic requirements for implementation in photodetection devices. Moreover, these MHPs possess long photocarrier transport lengths of at least 100 nm [11] and high charge carrier mobilities, which are also favorable for implementation in high-performance photodetectors. Tailorable absorption spectra is another exceptional optical characteristic of MHPs, so both broadband and narrowband absorption features are possible with MHP-based photodetectors. [12] In addition to the above features, MHPs have low-cost production facilities because they are solution-processable at low temperatures, like organic semiconductors. [13] These excellent optical and electrical properties of MHPs make them unique among photosensing materials, and they have a variety of applications. Although they have many positive aspects, there are still many challenges in enhancing the device performance Over the last few years, metal halide perovskites have established themselves as important materials in the field of optoelectronics. After their first application in photovoltaics, they have been successfully used in other optoelectronic devices, especially photodetectors, owing to their unparalleled optical and electronic properties. Notably, because of their unique optical and electronic properties and small physical dimensions, various carbon nanomaterials have emerged as alternatives for next-generation optoelectronic devices, and they have also been combined with other materials...

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Incorporating a Polar Molecule to Passivate Defects for Perovskite Solar Cells

Cited by 20 publications

References 35 publications

Bottom Interfacial Engineering for Methylammonium‐Free Regular‐Structure Planar Perovskite Solar Cells over 21%

Bottom Interfacial Engineering for Methylammonium‐Free Regular‐Structure Planar Perovskite Solar Cells over 21%

Graphene‐Based Materials in Planar Perovskite Solar Cells

Carbon Nanomaterials for Halide Perovskites‐Based Hybrid Photodetectors

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