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17 October 2007 Efficient photovoltaic devices based on blends of C60 and radical salt doped hole transporters
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Organic photovoltaics are the focus of intense research efforts due to the low-cost of processing and their potential applications in flexible electronics. We herein report efficient, thick (2,500 Å) photovoltaic devices based on ternary mixtures of polycarbonate linked TPD (N,N,N',N'-tetrakis(phenyl) benzidine)) polymer (PTPD), small molecular weight radical salt of a TPD derivative and C60 in an ITO/blend/Al configurations. While the addition of electron acceptor C60 moiety to PTPD produces a 3 orders more, short circuit current (Isc) of 0.22 mA/cm2, the presence of salt increased it further to 0.33 mA/cm2. This is attributed to the increased hole conductivity and absorption of PTPD matrix due to the presence of salt. In these 'PTPD/salt/C60' ternary blend devices, the fill factors as well as the power conversion efficiencies increased with increasing salt concentration with the highest fill factor of 0.4 and power conversion efficiency of 0.47% obtained in 10% salt doped ternary ITO/PTPD-salt-C60/Al device. To the best of our knowledge this is the first time that a radical salt has been used into an organic photovoltaic device configuration. Along with discussing these results, we would also be discussing the interplay of the three components of this ternary system to both open circuit voltage (Voc) and Isc. Further optimization in structure and morphology of these devices can lead to significant performance enhancement.
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SanthiSagar Vaddiraju, Mathew Mathai, Emmanuel Kymakis, and Fotios Papadimitrakopoulos "Efficient photovoltaic devices based on blends of C60 and radical salt doped hole transporters", Proc. SPIE 6656, Organic Photovoltaics VIII, 66561B (17 October 2007);

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