TY - JOUR
T1 - Efficient inverted polymer solar cells via pyridine-based organic molecules as interfacial modification layer on sol-gel zinc oxide surface
AU - Ou, Ren Xiu
AU - Chen, Yen Chia
AU - Lin, Chen Hsueh
AU - Guo, Tzung Fang
AU - Wen, Ten Chin
N1 - Funding Information:
We are grateful for the financial support from the Ministry of Science and Technology of Taiwan under grants MOST 105-2221-E-006-253- MY3 . The assistance of Dr. Yao-Jane Hsu form National Synchrotron Radiation Research Center for XPS and UPS data is acknowledged.
Publisher Copyright:
© 2018
PY - 2018/12
Y1 - 2018/12
N2 - Pyridine-based organic molecules (POMs), 4-phenylpyridine (4-Py) and 4-tert-butylpyridine (4-tbp) were used to modify the sol-gel ZnO surface for inverted polymer solar cells (PSCs). X-ray photoelectron spectroscopic (XPS) results showed the formation of N–Zn bonding and the reduction of oxygen vacancies (Vo), depicting that POMs chemisorbed on Vo sites of ZnO surface to passivate O defects. From ultraviolet photoelectron spectroscopic (UPS) data, the work function (WF) of ZnO slightly decreased due to interfacial dipole, enhancing the electron extraction from ZnO surface. ZnO surface modified with POMs (ZnO/POMs) possessed smoother morphology and more hydrophobicity than the pristine ZnO surface, providing good interfacial contact with polymeric active layer. The improved surface properties benefited power conversion efficiency (PCE) of bulk-heterojunction (BHJ) PSCs and their stability. As a result, PSCs with ZnO/4-tbp and ZnO/4-Py achieved 9.29% and 9.07% respectively, while 8.16% with the pristine ZnO. Especially, PSCs with ZnO/4-tbp possessed the best PCE because of its intramolecular dipole from electron donating group. This study demonstrates the benefits of POMs modifying the sol-gol ZnO surface for inverted PSCs.
AB - Pyridine-based organic molecules (POMs), 4-phenylpyridine (4-Py) and 4-tert-butylpyridine (4-tbp) were used to modify the sol-gel ZnO surface for inverted polymer solar cells (PSCs). X-ray photoelectron spectroscopic (XPS) results showed the formation of N–Zn bonding and the reduction of oxygen vacancies (Vo), depicting that POMs chemisorbed on Vo sites of ZnO surface to passivate O defects. From ultraviolet photoelectron spectroscopic (UPS) data, the work function (WF) of ZnO slightly decreased due to interfacial dipole, enhancing the electron extraction from ZnO surface. ZnO surface modified with POMs (ZnO/POMs) possessed smoother morphology and more hydrophobicity than the pristine ZnO surface, providing good interfacial contact with polymeric active layer. The improved surface properties benefited power conversion efficiency (PCE) of bulk-heterojunction (BHJ) PSCs and their stability. As a result, PSCs with ZnO/4-tbp and ZnO/4-Py achieved 9.29% and 9.07% respectively, while 8.16% with the pristine ZnO. Especially, PSCs with ZnO/4-tbp possessed the best PCE because of its intramolecular dipole from electron donating group. This study demonstrates the benefits of POMs modifying the sol-gol ZnO surface for inverted PSCs.
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U2 - 10.1016/j.orgel.2018.09.012
DO - 10.1016/j.orgel.2018.09.012
M3 - Article
AN - SCOPUS:85053464578
SN - 1566-1199
VL - 63
SP - 93
EP - 97
JO - Organic Electronics: physics, materials, applications
JF - Organic Electronics: physics, materials, applications
ER -