通过化学气相沉积制备连续、高柔韧性和透明的用于有机光伏的石墨烯薄膜。
Continuous, highly flexible, and transparent graphene films by chemical vapor deposition for organic photovoltaics.
机构信息
Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, USA.
出版信息
ACS Nano. 2010 May 25;4(5):2865-73. doi: 10.1021/nn901587x.
We report the implementation of continuous, highly flexible, and transparent graphene films obtained by chemical vapor deposition (CVD) as transparent conductive electrodes (TCE) in organic photovoltaic cells. Graphene films were synthesized by CVD, transferred to transparent substrates, and evaluated in organic solar cell heterojunctions (TCE/poly-3,4-ethylenedioxythiophene:poly styrenesulfonate (PEDOT:PSS)/copper phthalocyanine/fullerene/bathocuproine/aluminum). Key to our success is the continuous nature of the CVD graphene films, which led to minimal surface roughness ( approximately 0.9 nm) and offered sheet resistance down to 230 Omega/sq (at 72% transparency), much lower than stacked graphene flakes at similar transparency. In addition, solar cells with CVD graphene and indium tin oxide (ITO) electrodes were fabricated side-by-side on flexible polyethylene terephthalate (PET) substrates and were confirmed to offer comparable performance, with power conversion efficiencies (eta) of 1.18 and 1.27%, respectively. Furthermore, CVD graphene solar cells demonstrated outstanding capability to operate under bending conditions up to 138 degrees , whereas the ITO-based devices displayed cracks and irreversible failure under bending of 60 degrees . Our work indicates the great potential of CVD graphene films for flexible photovoltaic applications.
我们报告了通过化学气相沉积（CVD）实现的连续、高灵活度和透明的石墨烯薄膜，将其用作有机光伏电池中的透明导电电极（TCE）。通过 CVD 合成石墨烯薄膜，将其转移到透明基底上，并在有机太阳能电池异质结（TCE/poly-3,4-ethylenedioxythiophene:poly styrenesulfonate (PEDOT:PSS)/铜酞菁/富勒烯/苯并环丁烯/铝）中进行评估。我们成功的关键是 CVD 石墨烯薄膜的连续性，这导致其表面粗糙度最小（约 0.9nm），并提供了低至 230 Ω/sq 的方阻（在 72%透明度下），远低于类似透明度的堆叠石墨烯薄片。此外，在柔性聚对苯二甲酸乙二醇酯（PET）基底上，我们并排制备了具有 CVD 石墨烯和铟锡氧化物（ITO）电极的太阳能电池，并证实它们具有相当的性能，分别具有 1.18%和 1.27%的功率转换效率（η）。此外，CVD 石墨烯太阳能电池在弯曲条件下表现出出色的工作能力，可弯曲至 138 度，而基于 ITO 的器件在 60 度弯曲下显示出裂纹和不可逆的失效。我们的工作表明 CVD 石墨烯薄膜在柔性光伏应用中有很大的潜力。
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