TY - JOUR
T1 - Significant stability enhancement in high-efficiency polymer
T2 - Fullerene bulk heterojunction solar cells by blocking ultraviolet photons from solar light
AU - Jeong, Jaehoon
AU - Seo, Jooyeok
AU - Nam, Sungho
AU - Han, Hyemi
AU - Kim, Hwajeong
AU - Anthopoulos, Thomas D.
AU - Bradley, Donal D.C.
AU - Kim, Youngkyoo
N1 - Funding Information:
J.J., J.S., and S.N. contributed equally to this work. This work was financially supported by the grants from Korean Government (NRF_2015R1A2A2A01003743, NRF_2014R1A1A3051165, Human Resource Training Project for Regional Innovation_ MOE(NRF_2014H1C1A1066748), Basic Science Research Program_2009-0093819, and Basic Research Laboratory Program_2011-0020264).
Publisher Copyright:
© 2015 The Authors. Published by WILEY-VCH Verlag GmbH & Co.
PY - 2016/4
Y1 - 2016/4
N2 - Achievement of extremely high stability for inverted-type polymer:fullerene solar cells is reported, which have bulk heterojunction (BHJ) layers consisting of poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b’]dithiophenealt-3-fluorothieno[3,4-b]thiophene-2-carboxylate] (PTB7-Th) and [6,6]-phenyl- C71-butyric acid methyl ester (PC71BM), by employing UV-cut filter (UCF) that is mounted on the front of glass substrates. The UCF can block most of UV photons below 403 nm at the expense of ≈20% reduction in the total intensity of solar light. Results show that the PTB7-Th:PC71BM solar cell with UCF exhibits extremely slow decay in power conversion efficiency (PCE) but a rapidly decayed PCE is measured for the device without UCF. The poor device stability without UCF is ascribed to the oxidative degradation of constituent materials in the BHJ layers, which give rise to the formation of PC71BM aggregates, as measured with high resolution and scanning transmission electron microscopy and X-ray photoelectron spectroscopy. The device stability cannot be improved by simply inserting poly(ethylene imine) (PEI) interfacial layer without UCF, whereas the lifetime of the PEI-inserted PTB7-Th:PC71BM solar cells is significantly enhanced when UCF is attached.
AB - Achievement of extremely high stability for inverted-type polymer:fullerene solar cells is reported, which have bulk heterojunction (BHJ) layers consisting of poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b’]dithiophenealt-3-fluorothieno[3,4-b]thiophene-2-carboxylate] (PTB7-Th) and [6,6]-phenyl- C71-butyric acid methyl ester (PC71BM), by employing UV-cut filter (UCF) that is mounted on the front of glass substrates. The UCF can block most of UV photons below 403 nm at the expense of ≈20% reduction in the total intensity of solar light. Results show that the PTB7-Th:PC71BM solar cell with UCF exhibits extremely slow decay in power conversion efficiency (PCE) but a rapidly decayed PCE is measured for the device without UCF. The poor device stability without UCF is ascribed to the oxidative degradation of constituent materials in the BHJ layers, which give rise to the formation of PC71BM aggregates, as measured with high resolution and scanning transmission electron microscopy and X-ray photoelectron spectroscopy. The device stability cannot be improved by simply inserting poly(ethylene imine) (PEI) interfacial layer without UCF, whereas the lifetime of the PEI-inserted PTB7-Th:PC71BM solar cells is significantly enhanced when UCF is attached.
UR - http://www.scopus.com/inward/record.url?scp=85003605047&partnerID=8YFLogxK
U2 - 10.1002/advs.201500269
DO - 10.1002/advs.201500269
M3 - Article
C2 - 27774398
AN - SCOPUS:85003605047
SN - 2198-3844
VL - 3
JO - Advanced Science
JF - Advanced Science
IS - 4
M1 - 1500269
ER -