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Quantum well solar cells for space; The Impact of carrier removal on end-of-life device performance

宇宙用量子井戸太陽電池; EOL時特性におけるキャリア枯渇の影響

Hoheisel, R.*; Gonz$'a$lez, M.*; Lumb, M.*; Scheiman, D.*; Messenger, S. R.*; Bailey, C. G.*; Lorentzen, J.*; Tibbits, T. N. D.*; 今泉 充*; 大島 武; 佐藤 真一郎; Jenkins, P. P.*; Walters, R. J.*

Hoheisel, R.*; Gonz$'a$lez, M.*; Lumb, M.*; Scheiman, D.*; Messenger, S. R.*; Bailey, C. G.*; Lorentzen, J.*; Tibbits, T. N. D.*; Imaizumi, Mitsuru*; Oshima, Takeshi; Sato, Shinichiro; Jenkins, P. P.*; Walters, R. J.*

多重量子井戸構造(MQW)を含む多接合太陽電池の放射線照射効果について詳細に調べた。太陽電池の放射線照射による特性劣化は、まず少数キャリア寿命の減少によって引き起こされるが、MQWではキャリア枯渇効果をさらに考慮する必要があることを明らかにした。また、MQWを含む領域は放射線照射によるキャリア枯渇効果によって擬似的に真性状態になるだけでなく、さらにn型もしくはp型へと転換することがわかった。これによって、MQWが位置するエミッタとベースの間の電界強度を低下し太陽電池特性の劣化が引き起こされるが、本稿ではこれを改善するデバイス設計について提案する。

In this paper a detailed analysis on the radiation response of solar cells with multi quantum-wells (MQW) included in the quasi-intrinsic region between the emitter and the base layer is presented. Whilst the primary source of radiation damage of photovoltaic devices is generally associated with minority carrier lifetime reduction, we found that in the case of MQW devices another effect of radiation damage, the so called carrier removal (CR) requires additional consideration. Experimental measurements and numerical simulations reveal that with increasing radiation dose, CR can alter the initially quasi-intrinsic background doping of the MQW region to become further n or p type. This can result in a significant narrowing and even in a collapse of the electrical field between the emitter and the base where the MQWs are located. Eventually, remarks for improved radiation hard MQW device designs are provided.

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