Ga3掺杂 电子传输层在ZnOSi异质结太阳能池中的应用和研究.docx

Abslract Abslract 上海师范大学硕士学位论文 only retain the properties of ZnO QDs，but also decrease the resistance of ZnO． Ga3+：ZnO belongs n-type semiconductor,internal carrier density is larger than that in ZnO QDs．So，resistance is reduced．We study the performances of Ga十： ZnO／Si heterojunction solar cells by various concentrate of Ga”．The performances of Ga3+：ZnO／Si heterojunction solar cells improve in different degrees．Compare with the ZnO／Si heterojunction solar cells，the power conversion efficiency improves by 5．65％． 3．The main role of the electron transport layer is transport and collection photo-generated carriers．Since the direction of electron transport in heterojunction is quasi-two—dimensional(the heterojunction interface parallel)． The transport and collection of photo—generated electron are affected．We choose the nano-graphite(O≈30nm)as the electron transport layer．The electron mobility increases obviously,which due to that the graphite is conductor and the increasing of carrier density is leading to the ionized impurity scattering and piezoelectric scattering which play great roles in electron mobility are shielded efficiently．So， the power conversion efficiency improves．Compare with the ZnO／Si heterojunction solar cells and Ga+：ZnO／Si heterojunction solar cells，PCE increases by 1 0．1％and 4．2％respectively． Keywords：Wide band gap semiconductor,heterostructures，quantum dots，metal ion-doped，electron transport layer,multiple exciton generation performance，electron mobility,crystalline silicon solar cells Paper type：research report lV 万方数据 上海师范大学硕士学位论文 上海师范大学硕士学位论文 目录 目录 摘要 ．I Abstract Ⅲ 目录 ．V 第一章绪论 ．1 1．1研究背景 l 1．2光伏增效新技术解析 3 1．2．1半导体异质结技术 3 1。2．2量子点技术 3 1．2．3多重激子产生效应 4 1．2．4金属离子掺杂 5 1．2．5电子传输层 5 1．3太阳能电池性能表征 ．6 1．3．1霍尔效应测试仪 6 1．3．2载流子寿命测试 7 1．3．3光谱响应测试 8 1．3．4电流．电压特性测试 9 1．3．5填充因子 ．．10 1．3．6转换效率 ．．10 1．4选题意义及研究内容 ．1 1 第二章ZnO量子点的制备及在光伏电池上的应用 13 2．1引言 13 2．2实验部分 ．14 2．2．1化学试剂及原料 一14 2．2．2实验设备 ．．14 2．2．3实验步骤 ．．1 5 2．2．4结构表征与性能测试 一15 2．3结果与讨论 ．．1 7 2．3．1量子点的成分