High-Performance Electron-Transport-Layer-Free Quantum Junction Solar Cells with Improved Efficiency Exceeding 10%
High-Performance Electron-Transport-Layer-Free Quantum Junction Solar Cells with Improved Efficiency Exceeding 10%
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高性能%20无电子传输层%20Quantum%20Junction%20太阳能%20Cells%20with%20改进%20效率%20Exceeding%2010%
DOI：
10.1021/acsenergylett.0c02497
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发表时间：
2021-01-13
影响因子：
22
通讯作者：
Segawa, Hiroshi
中科院分区：
文献类型：
--
作者：
Jia, Yuwen;Wang, Haibin;Segawa, Hiroshi
胶体量子点太阳能电池（CQDSC）由于其宽的光响应范围、高的理论效率和溶液可加工性而成为低成本发电机的良好候选者。然而，通常使用的金属氧化物电子传输层（MOETL）引起的各种问题，如能带对准失配，高能光子损失，和光致界面退化的CQDSC的性能提高，阻碍。在本文所述的工作中，我们构建了基于量子结器件结构的高效和空气稳定的无MOETL太阳能电池，通过配体工程操纵PbS CQD的半导体和表面陷阱性质。我们的无MOETL量子结太阳能电池（QJSC）成功实现了创纪录的10.5%的功率转换效率。由于紫外和近红外光响应增强，在无MOETL的QJSC中获得了增加的光生电流密度。这些未包封的无MOETL QJSC显示出长期空气储存稳定性（>4000 h）。我们的工作成功地证明了无MOETL量子结作为太阳能电池的高效和稳定结构，为CQDSC在全光谱，可规模化生产，便携式和灵活的光伏技术中的应用铺平了道路。
Colloidal quantum dot solar cells (CQDSCs) are good candidates for low-cost power generators, due to their wide light-response range, high theoretical efficiency, and solution processability. Nevertheless, the generally used metal oxide electron transport layer (MOETL) induced various problems, blocking the performance enhancement of CQDSCs, such as band alignment mismatch, high-energy photon loss, and photoinduced interfacial degradation. In the work described herein, we constructed high-efficiency and air-stable MOETL-free solar cells based on quantum junction device structure, through manipulating the semiconductor and surface-trap properties of PbS CQDs by ligand engineering. A record power conversion efficiency of 10.5% was successfully achieved in our MOETL-free quantum junction solar cells (QJSCs). Increased photogenerated current density was obtained in MOETL-free QJSCs because of the ultraviolet and near-infrared photoresponse enhancement. These unencapsulated MOETL-free QJSCs show long-term air-storage stability (>4000 h). Our work successfully demonstrates the MOETL-free quantum junction as a high-efficiency and stable structure for solar cells, paving a way for application of CQDSCs in the full-spectrum, scalable-production, portable, and flexible photovoltaic technology.