A thin-film polycrystalline photoelectrochemical cell with 8% solar conversion efficiency
A thin-film polycrystalline photoelectrochemical cell with 8% solar conversion efficiency
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A%20薄膜%20多晶%20光电化学%20电池%20with%208%%20太阳能%20转换%20效率
作者：
G. Hodes
光电化学太阳能电池（佩奇）可以成为将光转换为电的经济方法，这主要是由于多晶半导体-电解质结的形成简单性和质量。在过去的几年里，基于薄层多晶的电池的转换效率已经从10.1%增加到最近报道的7.3%，对于n-GaAs/Sex 2 −系统1。基于CdSe-多硫化物体系的佩奇最近得到了广泛的研究。CdTe的带隙Eg = 1.45 eV比CdSe（Eg = 1.75 eV）更好地匹配太阳光谱，但在多硫化物溶液中作为光阳极在正常太阳辐射下（>10 mA cm−2）的电流密度下不稳定。这里描述了一种基于多硫化物的PEC，其使用CdSe 0.65 Te 0.35的多晶层，其电极通过将半导体浆料涂敷到T1衬底上并烧结来制备。这些层的后续表面处理导致高达8%的太阳能-电力转换效率，具有与薄层多晶CdSe/多硫化物系统2相当的稳定性。
Photoelectrochemical solar cells (PECs) may become an economic method for conversion of light to electricity, due largely to the simplicity of formation, and quality, of the poly-crystalline semiconductor–electrolyte junction. Within the past few years, conversion efficiencies of thin-layer poly crystalline-based cells have increased from ∼1% to a recently reported 7.3% for the n-GaAs/Sex2− system1. PECs based on the CdSe–polysulphide system have been studied extensively recently. CdTe, with a band-gap, Eg, ∼1.45 eV is better matched to the solar spectrum than CdSe (Eg∼1·75 eV), but is unstable in polysulphide solutions as a photoanode at the current densities to be expected under normal solar irradiation (>10 mA cm−2). A poly sulphide-based PEC is described here which uses poly-crystalline layers of CdSe0.65Te0.35, electrodes of which are prepared by painting a slurry of the semiconductor onto a T1 substrate, and sintering. Subsequent surface treatments of these layers lead to a solar-to-electrical conversion efficiency of up to 8%, with stability comparable to the thin-layer polycrystalline CdSe/polysulphide system2.