Abstract
A systematical investigation was carried out into the effects of the hole-transporting layer treatment of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) on the performance of planar hybrid n-Si/PEDOT:PSS solar cells. Triton X-100 and ethylene glycol (EG) were chosen to improve the conductivity and surface morphology of the PEDOT:PSS film. It was found that the annealing temperature has a great influence on the PEDOT:PSS material properties and the corresponding device performance. By optimizing the annealing temperature, the conductivity of the PEDOT:PSS film doped with Triton X-100 and EG could be enhanced by a factor of more than three orders. And the corresponding device also shows record power conversion efficiency as high as 14.5% with an open circuit voltage of 0.627 V, a short circuit current of 32.6 mA/cm2, and a fill factor of 70.7%.
Highlights
The solar cell is an efficient way to convert solar energy to electric power [1]
The aim of the current study is to systematically investigate the effects of the hole-transporting layer treatment of PEDOT:PSS on the performance of planar hybrid n-Si/PEDOT:PSS solar cells
Lights are illuminated from the top of the cell, where the PEDOT:PSS film is more than 90% transparent at such a thickness in the visible spectral range
Summary
The solar cell is an efficient way to convert solar energy to electric power [1]. Presently, the mono- and multicrystalline silicon solar cells still dominate more than 90% of the PV market owing to their materials abundance and mature fabrication techniques. PEDOT:PSS is a water-soluble polymer which has high conductivity, a transmission window in the visible spectral range, and an excellent chemical and thermal stability [7]. This type of Si/PEDOT:PSS hybrid solar cell combines the superior absorption property of Si in a wide spectrum range and the advantage of aqueous solution-based processes for PEDOT:PSS [4], which avoids an expensive high-temperature process and promises a low-cost photovoltaic technique with the potential to realize a power conversion efficiency (PCE) as high as 22% in theory [5]
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