2端III-V//Si三结太阳能电池，AM1.5g功率转换效率为35.9%,Progress in Photovoltaics

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2端III-V//Si三结太阳能电池，AM1.5g功率转换效率为35.9%
Progress in Photovoltaics ( IF 8.0 ) Pub Date : 2021-11-03 , DOI: 10.1002/pip.3503
Patrick Schygulla ₁ , Ralph Müller ₁ , David Lackner ₁ , Oliver Höhn ₁ , Hubert Hauser ₁ , Benedikt Bläsi ₁ , Felix Predan ₁ , Jan Benick ₁ , Martin Hermle ₁ , Stefan W. Glunz ₁ , Frank Dimroth ₁

Affiliation

III-V//Si 多结太阳能电池提供了一种提高功率转换效率超出硅单结基本俄歇极限的途径。在这项工作中，我们展示了如何通过优化 III-V 顶部，在 AM1.5g 光谱下将两端晶圆键合的 III-V//Si 三结太阳能电池的效率从 34.1% 提高到 35.9%结构体。这是迄今为止报告的基于硅的多结太阳能电池技术的最高效率。这种改进是由两个主要因素实现的。首先，在中间单元中集成 GaInAsP 吸收器使开路电压增加了 51 mV。其次，所有子电池的更好电流匹配将短路电流提高了 0.7 mA/cm ². 研究了两种不同的生长方向，直立和倒置。采用直立生长结构实现了35.9% 的最高电池效率 ( V _oc = 3.248 V, j _sc = 13.1 mA/cm ² , FF = 84.3 %)。直立结构的处理需要额外的键合步骤，这会导致整个晶圆上电池性能的均匀性降低。与目前最好的三结太阳能电池的详细比较揭示了未来的改进机会和限制，分别考虑电压和电流。

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Two-terminal III–V//Si triple-junction solar cell with power conversion efficiency of 35.9 % at AM1.5g

III–V//Si multijunction solar cells offer a pathway to increase the power conversion efficiency beyond the fundamental Auger limit of silicon single-junctions. In this work, we demonstrate how the efficiency of a two-terminal wafer-bonded III–V//Si triple-junction solar cell is increased from 34.1 % to 35.9 % under an AM1.5g spectrum, by optimising the III–V top structure. This is the highest reported efficiency to date for silicon-based multijunction solar cell technologies. This improvement was accomplished by two main factors. First, the integration of a GaInAsP absorber in the middle cell increased the open-circuit voltage by 51 mV. Second, a better current matching of all subcells enhanced the short-circuit current by 0.7 mA/cm². Two different growth directions, upright and inverted, were investigated. The highest cell efficiency of 35.9 % (V_oc = 3.248 V, j_sc = 13.1 mA/cm², FF = 84.3 %) was achieved with an upright grown structure. Processing of upright structures requires additional bonding steps, which results in a reduced homogeneity of cell performance across the wafer. A detailed comparison with the currently best triple-junction solar cell reveals future improvement opportunities and limits, considering voltage and current, respectively.

更新日期：2021-11-03

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