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Characterization of photovoltaic devices based on P3HT and Optimization

Author: PengBo
Tutor: PanChunYue；ZouYingPing；LiYongZuo
School: Central South University
Course: Polymer Chemistry and Physics
Keywords: polymer solar cells additives thermal annealing
CLC: TM914.4
Type: Master's thesis
Year: 2011
Downloads: 131
Quote: 0
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Abstract


Bulk-heterojunction (BHJ) polymer solar cells (PSCs) have attracted considerable attention recently due to their advantages of easy fabrication, low cost, light weight, and flexibility in large-area applications. In this paper, we focus our interests on photovoltaic device based on P3HT. The main results are summarized as follows:(1) PSCs with indene addition product of [6,6]-phenyl-C61-butyric acid methyl esteras(IPCBM) as electron acceptor and poly(3-hexylthiophene) (P3HT) as electron donor were fabricated and characterized with the device structure of ITO/PEDOT:PSS/P3HT:IPCBM/Ca/Al. The photoactive layer was fabricated by solvent annealing process. The effects of donor/acceptor blend ratio, prethermal annealing temperature were investigated. After optimization, the power conversion efficiency of (PCE) the PSC reached 4.39% with Voc=0.72 V,Isc=9.49 mA/cm2, and FF=64.3% under the illumination of AM1.5G,100 mW/cm-2.(2) We investigated the influence of 3MT and 3HT additives on the morphology and photovoltaic performance of the PSCs based on P3HT:PCBM (1:1 w/w) blend. The 3MT-processed devices without thermal annealing exhibit PCE of 3.65%, which is similar with that (3.57%) of the PSC without additive but with thermal annealing at 150℃for 10min.(3) We studied the effect of the organic solvent treatment of the PEDOT:PSS modification layer on the photovoltaic performance of the PSCs. The power conversion efficiency of the P3HT/PCBM-based PSC with 2-propanol treated PEDOT:PSS modification layer reached 4.74% with aISC of 11.07 mA/cm2, aVoc of 0.61 V and a higher FF of 70.4% under the illumination of AM1.5G,100 mW/cm-2.The efficiency of 4.74% is among the highest values reported for P3HT/PCBM-based PSCs.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Photocell > Solar cells
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