太阳能电池导电铝浆研究

Huazhong University of Science & Technology Wuhan 430074, P.R.China January , 2012
独创性声明
本人声明所呈交的学位论文是我个人在导师指导下进行的研究工作及取得 的研究成果。尽我所知，除文中已经标明引用的内容外，本论文不包含任何其他 个人或集体已经发表或撰写过的研究成果。对本文的研究做出贡献的个人和集 体，均已在文中以明确方式标明。本人完全意识到，本声明的法律结果由本人承 担。
分 类 号 学校代码 10487
学号 M200970637 密级
硕士学位论文
太阳能电池导电铝浆研究
学 位 申请 人 ： 李帅俊 学 科 专 业 ： 材料学 指 导 教 师 ： 邱小林 教授 乔学亮 教授 答 辩 日 期 ： 2012 年 ቤተ መጻሕፍቲ ባይዱ 月
A Thesis Submitted in Partial Fulfillment of the Requirements for the Degree of Master of Engineering
III
华 中 科 技 大 学 硕 士 学 位 论 文
were fused under different temperature of 1000、1050、1100、1150℃ for 30 minutes to produce four kinds of glass powder, mixed them respectively with aluminum powder, organic binder and auxiliaries to prepare conductive paste, analyzed the pastes’ poach resistance. After the testing, We confirmed that 1050℃ was the best melting temperature. We also did DTA and XRD analysis to the glass sample which was produced under the temperature of 1050℃, the results showed that glass’s softening temperature was about 500℃, its structure was microcrystalline. On the basis of former work, we did experiment about the influence of glass powder and aluminum powder ’s proportion to the conductive paste’s property. Under the condition of glass and aluminum’s total content was 77%, We prepared five samples that with the content of glass is 5%、3%、2%、1%、0.8% respectively, then analyzed their poach resistance properties, adhesion and electrical resistivities. The results showed that with the decrease of glass powder, aluminum conductive paste’s poach resistance property became better, the adhesion and electrical resistivity decreased. From this experiment, we confirmed the paste which contained 1% glass powder had the best comprehensive property. At last, the best conductive paste was screen-printed on silicon slices and sintered into aluminum coating under 850℃ for 30s, its microstructure was observed by SEM, the SEM results showed that the aluminum powder piled densely and the alloy between aluminum and silicon was well formed. Based on all the above works, the experiment on improving aluminum conductive paste’s electrical property was done by the way of adding extra tin powder. It was mixed with the conductive paste at different proportion of 0.3%, 0.8%, 1.3%, and then the samples’s electrical properties were examined. The results showed that with the tin powder ’s increasing, the solar cell’s photoelectric conversion efficiency(Ncell), short circuit current(Isc) and the fill factor(FF) increased after first decreasing, open voltage(Uoc) and equivalent series resistance(Rs) decreased after first increasing, the equivalent parallel resistance(Rsh) decreased. When the tin powder ’s content was 1.3%,
关键词：硅太阳能电池 背电场 导电铝浆 玻璃粘结剂 耐水煮性能 光电性能 碳纳 米管 氟化改性
II
华 中 科 技 大 学 硕 士 学 位 论 文
ABSTRACT
With the exhausting of traditional energies (such as coal, petroleum) and the environmental pollution’s worsening, new types of energies including solar cell get more and more attention. Solar cell is a kind of idealist energy source which could convert sunlight into power directly and produces no pollution in the conversion process. In all types of solar cell, crystalline silicon cell is used widest for its mostly developed technology and highest efficiency. At present, the conversion rate of monocrystalline silicon solar cell could get 24.7% and that of polycrystalline silicon solar cell could get 19.8%. Aluminum conductive paste is a key material in forming of the back surface field (BSF) of silicon solar cell, which can improve solar cell’s performance by reducing light transmission, charge carriers’ neutralization and prolonging their existing time. The cost of crystalline silicon cell could be cut down and its efficiency increased. Just for the reasons mentioned, aluminum conductive paste used in crystalline silicon cell also becomes people’s research focus. This thesis made a deep exploration on glass powder, which was an important part of aluminum conductive paste. We obtained the suitable materials, proportion and melting method that could produce best glass powder and further, best aluminum conductive paste. After that, we also did research on the influence of glass powder and aluminum powder ’s proportion. On the basis of all these former working, we did experiments on improving the paste’s electrical property by adding tin powder and also got very good results. At last, a research was done on carbon nanotubes’s fluorination, which could promote their application in aluminum conductive paste. For the glass powder, our research focused mostly on the influence of melting temperature. We chose Bi2O3、B2O3、Al2O3、ZnO、SiO2、P2O5、Zn3（PO4）2· 4H2O as the raw materials and at the proportion of 45： 25： 2： 15： 3： 4： 6 to melt glass. Then they