Mechanisms for long carrier lifetime in Cd(Se)Te double heterostructures

被引：18

作者：

Amarasinghe, Mahisha ^{[1
,2
]}

Albin, David ^{[2
]}

Kuciauskas, Darius ^{[2
]}

Moseley, John ^{[2
]}

Perkins, Craig L. ^{[2
]}

Metzger, Wyatt K. ^{[2
]}

机构：

[1] Univ Illinois, Dept Phys, Chicago, IL 60607 USA

[2] Natl Renewable Energy Lab, Golden, CO 80401 USA

来源：

APPLIED PHYSICS LETTERS | 2021年 / 118卷 / 21期

关键词：

OPEN-CIRCUIT VOLTAGE; CDTE SOLAR-CELLS; POLYCRYSTALLINE CDTE; CADMIUM TELLURIDE; HIGH-EFFICIENCY; RECOMBINATION; PASSIVATION;

D O I：

10.1063/5.0047976

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

II-VI semiconductors are used in numerous electro-optical applications. For example, CdTe-based solar technology is cost competitive with other electricity generation sources, yet there is still significant room to improve. Carrier lifetime has historically been well below the radiative recombination limit. Lifetimes reaching beyond 100 ns can significantly enhance performance and enable novel device structures. Here, double heterostructures (DHs) with passivated interfaces demonstrate lifetimes exceeding 1 mu s, yet this appears only for CdSeTe and not for CdTe DHs. We compare the passivation mechanisms in CdTe and CdSeTe DHs. CdSeTe lifetimes on the order of 1 mu s correspond to a combination of superior intragrain lifetime, extremely low grain boundary recombination and greater Te4+ interfacial presence compared to CdTe.

引用

页数：5

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