- Similar or different: the same Spiro-core but different alkyl chains with apparently improved device performance of perovskite solar cells
-
By intelligently utilizing the odd-even effect existing in the melting points of alkanes as presented in the basic textbook of Organic Chemistry, different alkoxy groups were introduced to modify the structure of commercial Spiro-OMeTAD to give new Spiro derivatives of Spiro-OEtTAD, Spiro-OPrTAD, Spiro-OiPrTAD and Spiro-OBuTAD, with the aim to adjust the molecular packing status in perovskite solar cells as hole transporting compounds. Excitedly, with the introduction of ethoxy groups instead of the methoxy ones in Spiro-OMeTAD, Spiro-OEtTAD-based perovskite solar cells demonstrated the highest device performance of 20.16%, higher than that of Spiro-OMeTAD (18.64%).
- Liu, Fan,Bi, Shiqing,Wang, Xiaorui,Leng, Xuanye,Han, Mengmeng,Xue, Baoda,Li, Qianqian,Zhou, Huiqiong,Li, Zhen
-
-
Read Online
- Long-Term Stability of the Oxidized Hole-Transporting Materials used in Perovskite Solar Cells
-
The vast majority of the hole transporting materials require the use of chemical doping as an essential step for preparation of efficient perovskite solar cells. An oxidized organic hole-transporting material, obtained during a doping procedure, could potentially be one of the weak links in the device composition. It is not uncommon for the solar cell to heat up under summer sun; therefore, all device components must possess some degree of resistance to repetitive thermal stress. In the current publication, a series of oxidized hole-transporting materials have been synthesized and their long-term stability investigated. During thermal stability testing of the films, kept at 100 °C under an inert atmosphere, it was observed that oxidized HTMs start to degrade and partly revert to original unoxidized material. It is known that oxidized HTM, formed during doping, is responsible for the increased conductivity and ultimately for better efficiency of hole extraction process in the PSC device; therefore, observed instability of the oxidized HTMs in the thin films at elevated temperatures could be one of the causes of drop in conductivity reported for the doped spiro-OMeTAD. It could also potentially be one of the reasons why perovskite solar cells lose their efficiency under prolonged thermal stress.
- Kasparavicius, Ernestas,Magomedov, Artiom,Malinauskas, Tadas,Getautis, Vytautas
-
-
Read Online
- HETEROATOMIC-BASED HOLE-TRANSPORT MATERIALS
-
Heteroatomic hole transport materials are provided. The hole transport materials include a non-carbon core: two, four, or eight aromatic groups covalently bound to the non-carbon core; a. terminal substituted diphenylamine end unit on each aromatic group: and optionally aromatic linker groups linking the aromatic groups and the substituted diphenylamine end units. In some embodiments the non-carbon core is non-carbon central atom such as Si, Ge, B?, P+Sn or Pb. In other embodiments, the non-carbon core is a cubic silsesquioxane. Also provided are methods for making these materials. The materials are particularly useful as hole transport materials in perovskite solar cells.
- -
-
Paragraph 0013
(2021/04/30)
-
- Carbohydrate double-nitrogen heterocyclic carbene precursor salt and its preparation and use (by machine translation)
-
The present invention provides a carbohydrate double-nitrogen heterocyclic carbene precursor salt and its preparation and use, the structure shown in formula I: The invention through the cheap and easy to obtain, three-dimensional chemical rich monosaccharide as a chiral source of chiral catalyst, for two different synthesis method carbohydrate double-nitrogen heterocyclic carbene precursor salt, as a palladium-catalyzed Buchwald - Hartwig reaction catalyst, replacing the toxicity, extremely sensitive to water and oxygen phosphine, synthesis has the value of the practical application of the Spiro - OMeTAD and its derivatives, overcome the preparation Spiro - OMeTAD and its derivatives of complex steps, a plurality of product components, not easy purification, low yield and the like. (by machine translation)
- -
-
Paragraph 0042-0045
(2018/03/24)
-
- hole-transporting material for inorganic-organic hybrid perovskite solar cells
-
The present invention relates to a hole-transporting compound having a novel structure and, more specifically, to a hole-transporting compound for an inorganic/organic hybrid perovskite-based solar cell. In the present invention, the inorganic/organic hybrid perovskite-based solar cell including a hole-transporting body has very high generating efficiency.(AA) Hole transferring layer(BB) Inorganic/organic perovskite layer(CC) TiO_2 layer(DD) Transparent conductive film(FTO)COPYRIGHT KIPO 2016
- -
-
Paragraph 0135-0137
(2016/10/08)
-
- HOLE TRANSPORT MATERIAL
-
The invention relates to 2, 2', 7, 7'-tetrakis-(N,N'-di-4-methoxy-3- methylphenylamine)-9, 9'-spirofluorene, to a process for its preparation, and to its use as hole transport material for electronic or optoelectronic devices, especially for solid-state dye-sensitized solar cells.
- -
-
Page/Page column 16
(2015/04/22)
-
- O-methoxy substituents in spiro-OMeTAD for efficient inorganic-organic hybrid perovskite solar cells
-
Three spiro-OMeTAD derivatives have been synthesized and characterized by 1H/13C NMR spectroscopy and mass spectrometry. The optical and electronic properties of the derivatives were modified by changing the positions of the two methoxy substituents in each of the quadrants, as monitored by UV-vis spectroscopy and cyclic voltammetry measurements. The derivatives were employed as hole-transporting materials (HTMs), and their performances were compared for the fabrication of mesoporous TiO2/CH 3NH3PbI3/HTM/Au solar cells. Surprisingly, the cell performance was dependent on the positions of the OMe substituents. The derivative with o-OMe substituents showed highly improved performance by exhibiting a short-circuit current density of 21.2 mA/cm2, an open-circuit voltage of 1.02 V, and a fill factor of 77.6% under 1 sun illumination (100 mW/cm2), which resulted in an overall power conversion efficiency (PCE) of 16.7%, compared to ～15% for conventional p-OMe substituents. The PCE of 16.7% is the highest value reported to date for perovskite-based solar cells with spiro-OMeTAD.
- Jeon, Nam Joong,Lee, Hag Geun,Kim, Young Chan,Seo, Jangwon,Noh, Jun Hong,Lee, Jaemin,Seok, Sang Il
-
supporting information
p. 7837 - 7840
(2014/06/23)
-
