TY - JOUR
T1 - Improvement of organic solar cells by flexible substrate and ITO surface treatments
AU - Cheng, Yuang Tung
AU - Ho, Jyh Jier
AU - Wang, Chien Kun
AU - Lee, William
AU - Lu, Chih Chiang
AU - Yau, Bao Shun
AU - Nain, Jhen Liang
AU - Chang, Shun Hsyung
AU - Chang, Chiu Cheng
AU - Wang, Kang L.
N1 - Funding Information:
The authors acknowledge financial support from The National Science Council of Taiwan, R.O.C. under contract Nos. NSC 98-2622-E-019-006-CC3 and NSC 98-2221-E-019-003 .
PY - 2010/10/1
Y1 - 2010/10/1
N2 - In this paper, surface treatments on polyethylene terephthalate with polymeric hard coating (PET-HC) substrates are described. The effect of the contact angle on the treatment is first investigated. It has been observed that detergent is quite effective in removing organic contamination on the flexible PET-HC substrates. Next, using a DC-reactive magnetron sputter, indium tin oxide (ITO) thin films of 90 nm are grown on a substrate treated by detergent. Then, various ITO surface treatments are made for improving the performance of the finally developed organic solar cells with structure Al/P3HT:PCBM/PEDOT:PSS/ITO/ PET. It is found that the parameters of the ITO including resistivity, carrier concentration, transmittance, surface morphology, and work function depended on the surface treatments and significantly influence the solar cell performance. With the optimal conditions for detergent treatment on flexible PET substrates, the ITO film with a resistivity of 5.6 × 10 -4 Ω cm and average optical transmittance of 84.1% in the visible region are obtained. The optimal ITO surface treated by detergent for 5 min and then by UV ozone for 20 min exhibits the best WF value of 5.22 eV. This improves about 8.30% in the WF compared with that of the untreated ITO film. In the case of optimal treatment with the organic photovoltaic device, meanwhile, 36.6% enhancement in short circuit current density (J sc ) and 92.7% enhancement in conversion efficiency (η) over the untreated solar cell are obtained.
AB - In this paper, surface treatments on polyethylene terephthalate with polymeric hard coating (PET-HC) substrates are described. The effect of the contact angle on the treatment is first investigated. It has been observed that detergent is quite effective in removing organic contamination on the flexible PET-HC substrates. Next, using a DC-reactive magnetron sputter, indium tin oxide (ITO) thin films of 90 nm are grown on a substrate treated by detergent. Then, various ITO surface treatments are made for improving the performance of the finally developed organic solar cells with structure Al/P3HT:PCBM/PEDOT:PSS/ITO/ PET. It is found that the parameters of the ITO including resistivity, carrier concentration, transmittance, surface morphology, and work function depended on the surface treatments and significantly influence the solar cell performance. With the optimal conditions for detergent treatment on flexible PET substrates, the ITO film with a resistivity of 5.6 × 10 -4 Ω cm and average optical transmittance of 84.1% in the visible region are obtained. The optimal ITO surface treated by detergent for 5 min and then by UV ozone for 20 min exhibits the best WF value of 5.22 eV. This improves about 8.30% in the WF compared with that of the untreated ITO film. In the case of optimal treatment with the organic photovoltaic device, meanwhile, 36.6% enhancement in short circuit current density (J sc ) and 92.7% enhancement in conversion efficiency (η) over the untreated solar cell are obtained.
UR - http://www.scopus.com/inward/record.url?scp=77955429636&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77955429636&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2010.06.011
DO - 10.1016/j.apsusc.2010.06.011
M3 - Article
AN - SCOPUS:77955429636
SN - 0169-4332
VL - 256
SP - 7606
EP - 7611
JO - Applied Surface Science
JF - Applied Surface Science
IS - 24
ER -
