V_2O_5–B_2O_3金属氧化物玻璃对背钝化电池局域铝背场性能的影响
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摘要
采用不同V_2O_5–B_2O_3比例的金属氧化物玻璃粉(V–B–MO)制备了背钝化硅太阳能电池(PERC),对电池进行了电性能、扫描电子显微镜和电池电致发光(EL)等测试分析。对玻璃粉进行了热分析,研究了V–B–MO玻璃粉对PERC电池局域铝背场性能的影响。结果表明:当玻璃的V–B比例在质量比为25:35的情况下,电池有较高的开路电压和转换效率。通过对V–B–MO玻璃添加稀土元素氧化物La_2O_3,CeO_2等,可提高电池的电性能。玻璃的相变温度、熔化温区和熔化吸热量等热特性对局域铝背场的形成及填充率有直接的影响,熔点较低、熔化温区较窄的玻璃制作的电池有较好的光电转换效率。局域铝背场处存在完全填充、部分填充和没有填充3种状态,填充较差部位会在EL图像中产生黑线。
The passivated emitter and rear contact(PERC) silicon solar cells were prepared by using V_2O_5–B_2O_3 metal oxide(V–B–MO) glass frit at different V_2O_5–B_2O_3 ratios. The cells were analyzed by electrical properties test, scanning electron microscopy and electroluminescent(EL) measurement. The effect of V–B–MO glass frit on the local aluminum back surface ?eld performance of the PERC cells was investigated via thermal analysis. The results show that the cells have higher open circuit voltage and conversion efficiency when the V–B mass ratio of glass is 25:35. The electrical performance of the cells can be improved when the rare-earth element oxides such as La_2O_3, CeO_2, etc. are added to V–B–MO glass. The thermal characteristics of glass(i.e., phase transition temperature, melting temperature zone and melting heat absorption) have a direct impact on the formation of local aluminum back surface field and filling rate. Besides, the cells made of glass with a low melting point and a narrow melting temperature zone have a better photoelectric conversion efficiency of cells. There are three states at the local aluminum back surface field, i.e., full filling, partial filling and no filling. The black line appears in the EL image when the filling is poor.
The passivated emitter and rear contact(PERC) silicon solar cells were prepared by using V_2O_5–B_2O_3 metal oxide(V–B–MO) glass frit at different V_2O_5–B_2O_3 ratios. The cells were analyzed by electrical properties test, scanning electron microscopy and electroluminescent(EL) measurement. The effect of V–B–MO glass frit on the local aluminum back surface ?eld performance of the PERC cells was investigated via thermal analysis. The results show that the cells have higher open circuit voltage and conversion efficiency when the V–B mass ratio of glass is 25:35. The electrical performance of the cells can be improved when the rare-earth element oxides such as La_2O_3, CeO_2, etc. are added to V–B–MO glass. The thermal characteristics of glass(i.e., phase transition temperature, melting temperature zone and melting heat absorption) have a direct impact on the formation of local aluminum back surface field and filling rate. Besides, the cells made of glass with a low melting point and a narrow melting temperature zone have a better photoelectric conversion efficiency of cells. There are three states at the local aluminum back surface field, i.e., full filling, partial filling and no filling. The black line appears in the EL image when the filling is poor.
引文
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[3]TAGUCHI M,YANO A,TOHODA S,et al.24.7%record efficiency HIT solar cell on thin silicon wafer[J].IEEE J Photovolt,2014,4(1):96-99.
[4]ADACHI D,HERNANDEZ J L,YAMAMOTO K.Impact of carrier recombination on fill factor for large area heterojunction crystalline Si solar cell with 25.1%efficiency[J].Appl Phys Lett,2015,107(23):233506.
[5]YOSHIKAWA K,KAWASAKI H,YOSHIDA W,et al.Silicon heterojunction solar cell with interdigitated back contacts for a photoconversion efficiency over 26%[J].Nat Energy,2017,2(5):17032.
[6]ABERLE G A.Surface passivation of crystalline silicon solar cells:Areview[J].Prog Photovoltaics,2000,8(5):473-487.
[7]HUANG H B,LV J,BAO Y M,et al.20.8%industrial PERC solar cell:ALD Al2O3 rear surface passivation,efficiency loss mechanisms analysis and roadmap to 24%[J].Sol Energ Mat Sol C,2017,161:14-30.
[8]GREEN M.The passivated emitter and rear cell(PERC):From conception to mass production[J].Sol Energ Mat Sol C,2015,143:190-197.
[9]付明,程思国,王玥,等.Te-Bi玻璃对晶体硅太阳能电池正银电极性能的影响[J].无机材料学报,2016,31(8):785-790.FU Ming,CHENG Siguo,WANG Yue,et al.J Inorg Mater(in Chinese),2016,31(8):785-790.
[10]程思国,付明,周洪,等.正银浆料用无铅玻璃特征温度对晶体硅太阳能电池电性能的影响[J].硅酸盐学报,2017,45(10):1523-1529.CHENG Siguo,FU Ming,ZHOU Hong,et al.J Chin Ceram Soc,2017,45(10):1523-1529.
[11]王承遇,庞世红,陶瑛.无铅玻璃研制的进展[J].材料导报,2006,20(8):21-24.WANG Chengyu,PANG Shihong,TAO Yin.Mater Rev(in Chinese),2006,20(8):21-24.
[12]YOUNG J H,DAE S J,HYE Y K,et a1.Characteristics of ZnO-B2O3·SiO2-CaO glass frits prepared by spray pyrolysis as inorganic binder for Cu electrode[J].J Alloy and Compd,201l,509:8077-8081.
[13]KIM B N,KIM D H,KIM H J,et al.Characterization and cell performance of Al paste with an inorganic binder of Bi2O3-B2O3-ZnOsystem in Si solar cells[J].Curr Nanosci,2014,10(1):66-69.
[14]张宏,张凯,李哲,等.无铅玻璃粉中硼含量对太阳能电池铝电极性能的影响[J].电子元件与材料,2013,32(12):8-11.ZHANG Hong,ZHANG Kai,LI Zhe,et al.Electron Compon Mater(in Chinese),2013,32(12):8-11.