We investigate the effect of the modification of cellulose acetate propionate as an organic vehicle for silver paste on solar cell efficiency. For the modification of cellulose acetate propionate, poly(ethylene glycol) is introduced to the hydroxyl groups of a cellulose acetate propionate backbone via esterification reaction. The chemical structure and composition of poly(ethylene glycol) functionalized cellulose acetate propionate is characterized by Attenuated total reflectance Fourier transform infrared, 1H nuclear magnetic resonance, differential scanning calorimetry and thermogravimetric analysis. Due to the effect of structural change for poly(ethylene glycol) functionalized cellulose acetate propionate on the viscosity of silver paste, the solar cell efficiency increases from 18.524% to 18.652 %. In addition, when ethylene carbonate, which has a structure similar to poly(ethylene glycol), is introduced to cellulose acetate propionate via ring opening polymerization, we find that the efficiency of the solar cell increases from 18.524% to 18.622%.

Abstract
 1. 서 론
 2. 연구 방법
 3. 결과 및 고찰
  3.1 Cellulose acetate propionate-g-poly(ethyleneglycol) 합성
  3.2 CAP-PEG가 첨가된 태양전지의 효율 측정
  3.3 Cellulose acetate propionate-g-ethylenecarbonate가 첨가된 태양전지의 효율 측정
 4. 결 론
 References

• 김동민(서울대학교 화학생물공학부) | Dong Min Kim (Department of Chemical and Biological Engineering, Seoul National University)
• 임종찬(대주전자재료) | Jong Chan Lim (Daejoo Electronic Materials Co., LTD.)
• 김진현(대주전자재료) | Jin Hyun Kim (Daejoo Electronic Materials Co., LTD.)
• 차상호(경기대학교 화학공학과) | Sang-Ho Cha (Department of Chemical Engineering, Kyonggi University) Corresponding author
• 이종찬(서울대학교 화학생물공학부) | Jong-Chan Lee (Department of Chemical and Biological Engineering, Seoul National University) Corresponding author