1. 毕业设计（论文）的内容和要求

铜铟镓硒(cigs)光伏电池具有高光吸收系数、高转换效率、可调的禁带宽度、高稳定性、较强的抗辐射性能等优点, 被认为是未来最有前途的太阳能电池之一。

但与晶硅电池相比，电池效率仍然偏低，所以如何制备出高效器件十分关键。

cigs材料的带隙可以通过调节ga元素的掺杂进行调节，ga的梯度分布可以改变cigs吸收层的能带结构，影响载流子的传输和整个器件的性能，所以研究ga梯度优化已经成为提高电池性能的一个重要方向。

2. 参考文献

[1] Jackson P, Hariskos D, Wuerz R, et al. Properties of Cu(In,Ga)Se2 solar cells with new record efficiencies up to 21.7%[J]. Physica Status Solidi (RRL) - Rapid Research Letters, 2015,9(1):28~31. [2] Powalla M, Witte W, Jackson P, et al. CIGS Cells and Modules With High Efficiency on Glass and Flexible Substrates[J]. IEEE Journal of Photovoltaics, 2014,4(1):440~446. [3] Depr#233;durand V, Tanaka D, Aida Y, et al. Current loss due to recombination in Cu-rich CuInSe2 solar cells[J]. Journal of Applied Physics, 2014,115(4):44503. [4] Powalla M, Jackson P, Witte W, et al. High-efficiency Cu(In,Ga)Se2 cells and modules[J]. Solar Energy Materials and Solar Cells, 2013,119:51~58. [5] Lindahl J, Zimmermann U, Szaniawski P, et al. Inline Cu(In,Ga)Se2 Co-evaporation for High-Efficiency Solar Cells and Modules [J]. IEEE Journal of Photovoltaics, 2013,3(3):1100~1105. [6] Chiril#259; A, Reinhard P, Pianezzi F, et al. Potassium-induced surface modification of Cu(In,Ga)Se2 thin films for high-efficiency solar cells[J]. Nature Materials, 2013,12(12):1107~1111. [7] Reinhard P, Buecheler S, Tiwari A N. Technological status of Cu(In,Ga)(Se,S)2-based photovoltaics[J]. Solar Energy Materials and Solar Cells, 2013,119:287~290. [8] Nakada T. Invited Paper: CIGS-based thin film solar cells and modules: Unique material properties[J]. Electronic Materials Letters, 2012,8(2):179~185. [9] Seyrling S, Chirila A, G#252;ttler D, et al. CuIn1#8722;xGaxSe2 growth process modifications: Influences on microstructure, Na distribution, and device properties[J]. Solar Energy Materials and Solar Cells, 2011,95(6):1477~1481. [10] Chiril#259; A, Bloesch P, Seyrling S, et al. Cu(In,Ga)Se2 solar cell grown on flexible polymer substrate with efficiency exceeding 17%[J]. Progress in Photovoltaics: Research and Applications, 2011,19(5):560~564. [11] Chiril#259; A, Buecheler S, Pianezzi F, et al. Highly efficient Cu(In,Ga)Se2 solar cells grown on flexible polymer films[J]. Nature Materials, 2011,10(11):857~861. [12] ackson P, Hariskos D, Lotter E, et al. New world record efficiency for Cu(In,Ga)Se2 thin-film solar cells beyond 20%[J]. Progress in Photovoltaics: Research and Applications, 2011,19(7):894~897. [13] Cao Q, Gunawan O, Copel M, et al. Defects in Cu (In, Ga) Se2 chalcopyrite semiconductors: a comparative study of material properties, defect states, and photovoltaic performance[J]. Advanced Energy Materials, 2011, 1(5): 845-853. [14] Seyrling S, Calnan S, B#252;cheler S, et al. CuIn1#8722;xGaxSe2 photovoltaic devices for tandem solar cell application[J]. Thin Solid Films, 2009,517(7):2411~2414. [15] Nakada T, Hirabayashi Y, Tokado T. Cu (In1-x, Gax) Se2-based thin film solar cells using transparent conducting back contacts[J]. Japanese Journal of Applied Physics, 2002, 41(11A): L1209.

3. 毕业设计（论文）进程安排

2016.12.12-2017.1.2, 文献调研，完成开题报告 1.3-1.13，完成英文翻译 3.14-4.21，深刻理解CIGS太阳能电池原理，学习和掌握SCAPS软件 4.22-5.5，进行模拟、初步分析结果和中期检查 5.6-5.26，进一步完善模拟结果,并分析全部数据 5.27-6.2，论文撰写 6.3-6.6，论文修改 6.7-6.14，准备PPT，答辩