期刊
PROGRESS IN PHOTOVOLTAICS
卷 23, 期 11, 页码 1526-1535出版社
WILEY
DOI: 10.1002/pip.2586
关键词
interface states; bulk defects; dielectric constant; small-molecule sole cells
资金
- A*STAR SERC TSRP grant [102 170 0137]
The AC properties of high-efficiency (=8.01% under standard 100mW/cm(2) AM1.5 illumination) small-molecule bulk heterojunction (SM BHJ) solar cells (p-DTS(FBTTh2)(2)/PC70BM) at different DC biases and frequencies of small amplitude (+/- 10mV) AC signal in the dark at room temperature were investigated in details. We showed the presence of interface states at the heterojunction interface and determined their parameters from the analysis of spectral distributions of real and imaginary components of the measured impedance. The dielectric constant of BHJ epsilon(BHJ)=2.9 was determined from the geometrical capacitance of totally depleted BHJ layer. We explained quantitatively the effect of interface states and series resistance on the measured C-V characteristics of the SM BHJ solar cells at both low and high frequencies. The quantitative value of the density of defect states in the bulk N=1.05x10(16)cm(-3) was determined from the high frequency C-V characteristic corrected by the effect of the series resistance. Copyright (c) 2015 John Wiley & Sons, Ltd.
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