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Enhanced Thermal Stability of Inverted Polymer Solar Cells with Pentacene
Author(s) -
Yang Feng,
Kim JaeHyoung,
Ge Ziyi,
Kim YongSang
Publication year - 2015
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.201400212
Subject(s) - pedot:pss , organic solar cell , thermal stability , chemistry , indium tin oxide , energy conversion efficiency , polystyrene sulfonate , pentacene , chemical engineering , polystyrene , active layer , annealing (glass) , polymer solar cell , polymer , materials science , optoelectronics , layer (electronics) , organic chemistry , composite material , thin film transistor , engineering
In this study, we focused on the thermal stability of organic solar cells based on poly(3‐hexylthiophene) (P3HT) and (6,6)‐phenyl C 61 ‐butyric acid methyl ester (PCBM), fabricated by blends of P3HT : PCBM : pentacene. Enhanced thermal stability of organic solar cells was achieved by introducing pentacene (Pc) into blends of P3HT : PCBM in organic solar cells with the structure indium tin oxide/ZnO/P3HT : PCBM : Pc/poly(3,4‐ethylenedioxythiophene) : polystyrene sulfonate/Ag (ITO/ZnO/P3HT : PCBM : Pc/PEDOT : PSS/Ag). The donor‐acceptor interfaces of devices with Pc were more stable than those without Pc in the active layer. During the thermal annealing process, the Pc in the P3HT : PCBM blends suppressed the crystallization of P3HT and PCBM, which was confirmed by optical microscopic images and UV‐visible absorption spectra. The power conversion efficiency (PCE) of the device with Pc was reduced to no less than 70 % of its original efficiency after keeping it at 120 °C for 24 hours, while that of the non‐Pc device was reduced to 13 % of its original efficiency after 24 hours at the same temperature. Based on these results, we propose a new Pc‐blended organic solar cell that has advantages in the thermal annealing process.