Exploring photocurrent output from donor/acceptor bulk-heterojunctions by monitoring exciton quenching

doi:10.1088/1674-1056/24/6/063301

Abstract In this work, a series of polymer bulk-heterojunctions is fabricated based on the combinations of different donors (Ds) (P3HT and PCPDTBT) and acceptors (As) (PCBM, ICBA, and F8BT). Exciton quenching efficiencies of the D–A pairs are obtained in order to quantify charge-transfer between the donor and the acceptor via a modified approach developed in conjunction with experimental results of optical absorption and photoluminescence spectra. It is discovered that the exciton quenching efficiency in the combination of PCPDTBT:PCBM and P3HT:PCBM reaches 70% and over, but in PCPDTBT:ICBA it is about 12%. A relatively high ΔLUMO_{donor-acceptor} results in a relatively high exciton quenching efficiency, which is responsible for better charge separation. The results agreed well with the photocurrent effect of the heterojunction layers. The work offers a convenient way to predict a potentially promising photovoltaic material with a selected D–A pair.

Keywords: exciton quenching optical absorption photoluminescence photocurrent

Received: 21 December 2014
Revised: 17 January 2015
Accepted manuscript online:

PACS:	33.50.-j	(Fluorescence and phosphorescence; radiationless transitions, quenching (intersystem crossing, internal conversion))
	78.20.-e	(Optical properties of bulk materials and thin films)
	73.50.Pz	(Photoconduction and photovoltaic effects)
	88.40.jr	(Organic photovoltaics)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 21174016 and 11474017), the Fundamental Research Funds for the Central Universities (Grant No. 2013JBZ004), and the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20120009110031).

Corresponding Authors: He Zhi-Qun
E-mail: zhqhe@bjtu.edu.cn

About author: 33.50.-j; 78.20.-e; 73.50.Pz; 88.40.jr

Cite this article:

Wang Xin-Ping (王新平), He Zhi-Qun (何志群), Liang Chun-Jun (梁春军), Qiu Hai-An (邱海安), Jing Xi-Ping (荆西平) Exploring photocurrent output from donor/acceptor bulk-heterojunctions by monitoring exciton quenching 2015 Chin. Phys. B 24 063301

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Exploring photocurrent output from donor/acceptor bulk-heterojunctions by monitoring exciton quenching

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