Polymeric Electron-Selective Contact for Crystalline Silicon Solar Cells with an Efficiency Exceeding 19%,ACS Energy Letters

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Polymeric Electron-Selective Contact for Crystalline Silicon Solar Cells with an Efficiency Exceeding 19%
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-02-24 , DOI: 10.1021/acsenergylett.0c00110
Wenbo Ji _{1,

2,

3} , Thomas Allen ₄ , Xinbo Yang ₄ , Guosong Zeng ₅ , Stefaan De Wolf ₄ , Ali Javey _{1,

2}

Affiliation

Carrier-selective contacts have become a prominent path forward toward efficient crystalline silicon (c-Si) photovoltaics. Among the proposed contacting materials, organic materials may offer simplified and low-cost processing compared with typical vacuum deposition techniques. Here, branched polyethylenimine (b-PEI) is presented as an electron-transport layer (ETL) for c-Si solar cells. The incorporation of a b-PEI interlayer between c-Si(n) and Al leads to a low contact resistivity of 24 mΩ cm². A silicon heterojunction solar cell integrated with b-PEI is demonstrated achieving a power conversion efficiency of 19.4%, which improves the benchmark efficiency of a c-Si solar cell with an organic ETL. This electron selectivity of b-PEI is attributed to its Lewis basicity, i.e., electron-donating ability, promoting favorable band bending at the c-Si surface for electron transport. Moreover, several other Lewis base polymers perform as efficient ETLs in organic/c-Si hybrid devices, indicating Lewis basicity could be a guideline for future organic ETL design.

中文翻译：

晶体硅太阳能电池的聚合物电子选择性接触效率超过19％

载流子选择接触已成为通往有效晶体硅（c-Si）光伏电池的重要途径。在提出的接触材料中，与典型的真空沉积技术相比，有机材料可以提供简化且低成本的处理。在这里，支链聚乙烯亚胺（b-PEI）作为c-Si太阳能电池的电子传输层（ETL）出现。在c-Si（n）和Al之间掺入b-PEI中间层会导致24mΩcm ²的低接触电阻率。已证明，与b-PEI集成的硅异质结太阳能电池可实现19.4％的功率转换效率，从而提高了具有有机ETL的c-Si太阳能电池的基准效率。b-PEI的这种电子选择性归因于它的Lewis碱度，即电子给体能力，促进了c-Si表面上有利于电子传输的能带弯曲。此外，其他几种路易斯基础聚合物在有机/ c-Si杂化器件中可作为有效的ETL，这表明Lewis的碱度可能是未来有机ETL设计的指南。

更新日期：2020-02-25

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