• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

2014 Fiscal Year Final Research Report

Development of solar cells with high stability at elevated temperatures

Research Project

  • PDF
Project/Area Number 23360163
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Electronic materials/Electric materials
Research InstitutionWaseda University

Principal Investigator

HORIKOSHI Yoshiji  早稲田大学, 理工学術院, 教授 (60287985)

Co-Investigator(Renkei-kenkyūsha) KAWAHARAZUKA Atsushi  早稲田大学, 理工学術院, 准教授 (40329082)
FUJITA Miki  早稲田大学, 理工学術院, 次席研究員 (60386729)
NISHINAGA Jiro  早稲田大学, 理工学術院, 准教授 (90454058)
Project Period (FY) 2011-04-01 – 2015-03-31
Keywords太陽電池 / 温度安定性 / 励起子吸収効果 / 分子線エピタキシー / 超格子太陽電池 / AlGaAs/GaAs超格子 / Si/SiO2超格子 / スパッタリング
Outline of Final Research Achievements

One of the most serious problems of solar cells is the degradation of solar cell efficiency(η) at elevated temperatures. This effect is probably caused by the bandgap(Eg) shrinkage at elevated temperatures. The shrinkage of Eg decreases Voc, and as a result, lowers η.In semiconductor superlattices(SLs), effective Eg includes an increment by quantum confinement effect which is rather temperature insensitive. Therefore, temperature stable solar cells could be achieved by using SL absorption layers.
We have fabricated AlGaAs/GaAs SL solar cells by using an optimized SL structure grown by MBE. Both Voc andη are found to be more temperature-stable compared with GaAs bulk solar cells with an equivalent solar cell structure. Even at 100℃, dη/dT is as low as 0.22%/deg which is the lowest ever reported. In addition, in SL solar cells, the excitonic absorption is found to be operative even at elevated temperatures which lead to the higher efficiency compared to bulk solar cells.

Free Research Field

半導体結晶成長、半導体デバイス

URL: 

Published: 2016-06-03  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi