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Sökning: WFRF:(Xie Yongshu) > (2015-2019) > Solar cells sensiti...

Solar cells sensitized with porphyrin dyes with a carbazole donor : The effects of an auxiliary benzothiadiazole acceptor and bulky substituents on the donor

Tang, Yunyu (författare)
Chinese Acad Fishery Sci, Lab Qual Safety & Proc Aquat Prod, East China Sea Fisheries Res Inst, Jungong 300, Shanghai 200090, Peoples R China.
Wang, Yueqiang (författare)
East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Meilong 130, Shanghai 200237, Peoples R China.;East China Univ Sci & Technol, Sch Chem & Mol Engn, Inst Fine Chem, Meilong 130, Shanghai 200237, Peoples R China.
Song, Heli (författare)
East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Meilong 130, Shanghai 200237, Peoples R China.;East China Univ Sci & Technol, Sch Chem & Mol Engn, Inst Fine Chem, Meilong 130, Shanghai 200237, Peoples R China.
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Liu, Qingyun (författare)
Shandong Univ Sci & Technol, Coll Chem & Environm Engn, Qingdao, Shandong, Peoples R China.
Li, Xin (författare)
KTH,Teoretisk kemi och biologi
Cai, Youqiong (författare)
Chinese Acad Fishery Sci, Lab Qual Safety & Proc Aquat Prod, East China Sea Fisheries Res Inst, Jungong 300, Shanghai 200090, Peoples R China.
Xie, Yongshu (författare)
East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Meilong 130, Shanghai 200237, Peoples R China.;East China Univ Sci & Technol, Sch Chem & Mol Engn, Inst Fine Chem, Meilong 130, Shanghai 200237, Peoples R China.
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Chinese Acad Fishery Sci, Lab Qual Safety & Proc Aquat Prod, East China Sea Fisheries Res Inst, Jungong 300, Shanghai 200090, Peoples R China East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Meilong 130, Shanghai 200237, Peoples R China.;East China Univ Sci & Technol, Sch Chem & Mol Engn, Inst Fine Chem, Meilong 130, Shanghai 200237, Peoples R China. (creator_code:org_t)
ELSEVIER SCI LTD, 2019
2019
Engelska.
Ingår i: Dyes and pigments. - : ELSEVIER SCI LTD. - 0143-7208 .- 1873-3743. ; 171
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • Three porphyrin sensitizers XW54-XW56 containing a carbazole donor have been designed and synthesized by introducing a benzothiadiazole (BTD) unit as the auxiliary electron acceptor to extend the absorption spectra and/or bulky dihexyloxyphenyl groups into the carbazole unit to suppress dye aggregation and improve the photovoltage (V-OC). The BTD unit incorporated in XW54 obviously broadens and red-shifts the absorption threshold to ca. 700 nm, as compared with that of 650 nm observed for XW1. Thus, XW54 exhibits a much broader monochromatic photon-to-electron conversion efficiency (IPCE) spectrum with an extremely red-shifted onset wavelength of 780 nm, resulting in a photocurrent density (J(SC)) of 11.60 mA cm(-2), higher than that of XW1. Unfortunately, the V-OC value was decreased owing to the more severe dye aggregation caused by the large conjugation framework induced by the presence of the BTD unit. As a result, XW54 shows an efficiency of 6.26%, slightly higher than that of 6.11% obtained for XW1. On the other hand, with the bulky dihexyloxyphenyl donor groups introduced to XW55, a highest V-OC, of 860 mV was achieved, which can be ascribed to the efficient prevention of charge recombination and suppression of dye aggregation. Thus, XW55-based cells exhibit an improved efficiency of 6.60%. On the basis of XW54 and XW55, two bulky dihexyloxyphenyl groups and a BTD unit were simultaneously introduced to XW56, affording a highest efficiency of 7.03%, with the J(SC )and V-OC, values of 12.5 mA cm(-2) and 785 mV, respectively. These results compose a novel approach for developing efficient dye-sensitized solar cells (DSSCs) by simultaneously introducing bulky dihexyloxyphenyl groups and a benzothiadiazole unit, which may synergistically broaden the absorption spectra and suppress the dye aggregation, resulting in improved photocurrent and photovoltage.

Ämnesord

NATURVETENSKAP  -- Kemi -- Fysikalisk kemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Physical Chemistry (hsv//eng)

Nyckelord

Dye-sensitized solar cells
Porphyrin
Sensitizers
Carbazole
Bulky groups
Kemi
Chemistry

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