A Strategy to Obtain Long‐Term Stable Heteropoly Blues for Photosensitive Property Investigations. Issue 14 (19th April 2018)

• Record Type: Journal Article
• Authors: Li, Jianping; Chen, Weilin; Chen, Li; Zheng, Xiaotao; Zhu, Guangshan; Wang, Enbo
• Is Part Of: Advanced optical materials. Volume 6:Issue 14(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-04-19
• Subjects: heteropoly blues -- inorganic photosensitizer -- photoresponse -- polyoxometalates -- wide spectrum; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.201800225
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: The photosensitizer is the soul of dye‐sensitized solar cells (DSSCs), i.e., the key factor influencing the performance of DSSCs. The commonly used photosensitizers are expensive carboxylic pyridine ruthenium‐based complexes, so it is urgent to develop low‐cost photosensitizers. Heteropoly blues (HPBs) could be a kind of excellent photosensitizers due to their wide spectra absorption; however, most of them are hardly stable in the air. Here, a strategy of combining the improved vacuum thermal evaporation solid‐state reduction (Al as the reductant) and layer‐by‐layer self‐assembly is employed to obtain a series of long‐term stable HPBs nanocomposite films (classical Keggin and Dawson HPBs). The photosensitive properties of the obtained HPBs are revealed by optical and photoresponse measurements. Particularly, the obtained HPBs have wider visible light absorption and higher exciton dissociation efficiency, which not only improve the photoresponse of TiO2 ({TiO2 }5 /{PW12 }6 ‐Al (HPB) film with 28.9 µA), but also generate high photocurrent ({PEI}30 /{PMo12 }30 ‐Re‐Al (HPB) film with 130 µA). Furthermore, the effects of the structure, the elements composition, and the different electron reduction degree on the photosensitive properties have been discussed based on comparison of the photoresponse signals of different HPBs. Abstract : The strategy of combining an improved vacuum thermal evaporation solid‐state reduction (with Al as the reductant) and layer‐by‐layer self‐assembly is used to obtain a series of long‐term stable Keggin and Dawson heteropoly blues (HPBs) nanocomposite films. The optical and photoresponse measurements reveal that HPBs possess a wider visible light absorption, higher exciton dissociation efficiency, and excellent photosensitivity.