Amorphous/crystalline blend effects on the performance of polymer-based photovoltaic cells

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	Amorphous/crystalline blend effects on the performance of polymer-based photovoltaic cells
其他题名	Amorphous/crystalline blend effects on the performance of polymer-based photovoltaic cells
	2009
发表期刊	ACTA PHYSICA SINICA
ISSN	1000-3290
摘要	Bilayer TiO2/polymer photovoltaic cells are prepared by using regioregular poly (3-hexylthiophene) (P3HT) and branched poly(ethyleneimine) (BPEI) as an additive to P3HT. Influences of BPEI, an amorphous polymer, on the performance of bilayer TiO2/P3HT cells are investigated by means of steady-state current-voltage measurements and dynamic intensity-modulated photovoltage spectroscopy, in combination with differential thermal analysis, UV-vis absorption and photoluminescence spectroscopy. Due to the high crystallinity of P3HT, bilayer TiO2/P3HT cell exhibits a poor performance. As P3HT is blended with BPEI in the weight ratio of W-BPEI/P3HT = 1 %-5 %, the performance of the devices is greatly improved; in particular, as W-BPEI/P3HT = 1 %, the cell exhibits an open-circuit voltage of 0.8 V and a short-circuit current of 20 mu A/cm(2). Results show that the influence of BPEI on the cell performance originates from the changed interfacial contact at TiO2/P3HT interface rather than the varied optical properties of P3HT in P3HT-BPEI blend. BPEI imposes two competitive effects on interfacial contact between TiO2 and P3HT, depending on the compositional structure of the blend. On one hand, BPEI improves the interfacial contact by reducing the crystallinity of P3HT and enhancing the interaction between P3HT and TiO2.. On the other hand, the interfacial contact will become worse with more BPEI chains accumulating on TiO2 surface. A good contact at TiO2/P3HT interface facilitates the access to a high exciton dissociation efficiency, a long lifetime of photogenerated electrons and further a high device efficiency. The results presented in this paper are expected to provide new insights and a novel strategy for improving the performance of polymer-based photovoltaic cells.
关键词	OPEN-CIRCUIT VOLTAGE SENSITIZED SOLAR-CELLS CONJUGATED POLYMER MOLECULAR-WEIGHT REGIOREGULAR POLY(3-HEXYLTHIOPHENE) PHOTOCURRENT SPECTROSCOPY INTERCHAIN INTERACTIONS ELECTRON-TRANSPORT TIO2 NANOPARTICLES BACK-REACTION poly (3-hexylthiophene) titania conjugated polymer photovoltaic cells
收录类别	CSCD
语种	英语
资助项目	[Chinese Academy of Sciences] ; [National Natural Science Foundation of China] ; [Scientific Research Foundation] ; [Returned Overseas Chinese Scholars] ; [State Education Ministry]
WOS记录号	WOS:000270156300114
CSCD记录号	CSCD:3671631
引用统计	被引频次：13[WOS] [WOS记录] [WOS相关记录] 被引频次：5[CSCD] [CSCD记录]
文献类型	期刊论文
条目标识符	http://ir.hfcas.ac.cn:8080/handle/334002/48382
专题	中国科学院合肥物质科学研究院
推荐引用方式 GB/T 7714	. Amorphous/crystalline blend effects on the performance of polymer-based photovoltaic cells[J]. ACTA PHYSICA SINICA,2009,58.
APA	(2009).Amorphous/crystalline blend effects on the performance of polymer-based photovoltaic cells.ACTA PHYSICA SINICA,58.
MLA	"Amorphous/crystalline blend effects on the performance of polymer-based photovoltaic cells".ACTA PHYSICA SINICA 58(2009).