Mr. Santhisagar Vaddiraju Profile

Santhisagar Vaddiraju

at Univ of Connecticut

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Proceedings Article | 17 October 2007 Paper

Efficient photovoltaic devices based on blends of C₆₀ and radical salt doped hole transporters

SanthiSagar Vaddiraju, Mathew Mathai, Emmanuel Kymakis, Fotios Papadimitrakopoulos

Proceedings Volume 6656, 66561B (2007) https://doi.org/10.1117/12.733971

KEYWORDS: Polymers, Aluminum, Binary data, Photovoltaics, Organic photovoltaics, Absorption, Electrodes, Electron transport, Telescopic pixel displays, Excitons

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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 (I_sc) 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 (V_oc) and I_sc. Further optimization in structure and morphology of these devices can lead to significant performance enhancement.

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