论文部分内容阅读
The average photoelectric conversion efficiency (PCE) of a bare mono crystalline silicon solar cell is 14.71％± 0.03％under AM1.5. It decreases to 14.20％± 0.005％ when covering an un-doped flat glass on the solar cell, and it goes down to 14.10％± 0.005％by using a 5 wt％Eu3+doped glass. The absorptions of the Eu3+ doped CPM glass one-to-one match the excitation spectra at 362, 381, 393, 400, 413 and 464 nm, which are related to the transitions of 7F0→(5D4, 5G2, 5L6, 5D3), 7F1→5D3, and 7F0→5D2, respectively. In addition, a concave pyramid microstructure (CPM) is embedded in the glass surface to increase light transmittance. The average PCE increases to 14.61％± 0.07％when a 5 wt％Eu3+doped CPM glass covers on the silicon solar cell. Compared with the un-doped flat glass, a net increase of the PCE is 0.41％, where the 0.16％ increment of PCE is from the lighting trapping of the CPM structure, and the downshifting of near ultraviolet (NUV) light by Eu3+ion donates the other 0.25％increment. It confirms that the as-prepared Eu3+doped CPM glass has a good downshifting and antireflection function.