Graded Bandgap Perovskite with Intrinsic n–p Homojunction Expands Photon Harvesting Range and Enables All Transport Layer‐Free Perovskite Solar Cells
摘要: 有机-无机卤化物钙钛矿因其吸引人的光电特性（如强光吸收性，高载流子迁移率和可调节带隙）而成为下一代光伏器件的有前途的材料。通常，钙钛矿太阳能电池需要载流子传输层（CTL）来提供内置电场并降低复合率。但是，目前合适的电子传输层和空穴传输层材料的成本很高，从而影响了钙钛矿光伏器件的产业化前景。 通过引入三步动态旋涂策略和可变价Sn元素，开发了具有梯度带隙的n-p钙钛矿同质结光吸收层。 钙钛矿吸收体的带隙逐渐从1.53 eV（底部）调整到1.27 eV（顶部）。电子在50nm尺度中从n型（过量PbI2，底部）运动p型（Sn空位，顶部）。 这种设计的钙钛矿同质结电子结构不仅将光收集范围从800 nm扩展到了970 nm，这提供了突破PCE极限的潜力，而且还促进了定向载流子传输并减弱了对CTL的依赖性。本文展示的非对称钙钛矿层展示了一种全新的方法，可以简化设备结构并提高不含CTL的钙钛矿太阳能电池的性能。
Haoxuan Sun Kaimo Deng Jie Xiong Liang Li First published: 24 January 2020
https://doi.org/10.1002/aenm.201903347
Schematic illustration of the fabrication process of mixed Pb/Sn perovskite, Pb-based perovskite, and graded Pb/Sn perovskite.
a–c) The energy band diagram of mixed Pb/Sn perovskite, Pb-based perovskite, and graded Pb/Sn perovskite. d–f) Glancing angle XRD
analysis of mixed Pb/Sn perovskite, Pb-based perovskite, and graded Pb/Sn perovskite.
CTL-dependence performance of different kinds of perovskite devices. a–c) J–V curves of PSCs with different device structure based on mixed
Pb/Sn perovskite, b) Pb-based perovskite, and graded Pb/Sn perovskite. d) Stabilized photocurrent of PSCs based on different kinds of perovskites.
众能智评
本文思路不错，从三方面分析：
1. 工艺相当于部分实现了钙钛矿自叠层，减少了CTL的使用。
2. 目前的CTL还是比较贵，且需要高温合成，本文的方法很好的解决这个问题。
3. 用锡替代了部分的铅，使得钙钛矿电池更加绿色。
众能光电简介：
我们是一家来自中国杭州的钙钛矿光电技术公司。我们除了研发和生产钙钛矿光电器件之外，还生产一些钙钛矿研发和生产级的设备，包括喷雾热解、激光刻蚀划线机、磁控溅射、真空蒸镀机、PECVD和SALD等。
Introduction to Perovs™
We are a perovskite photovoltaic technology company from Hangzhou, China. In addition to R & D and production of perovskite photovoltaic devices, we also produce some perovskite R & D and production-grade equipment, including spray pyrolysis, laser etching scribing machine, magnetron sputtering, vacuum evaporation machine, PECVD and SALD, etc.
Email: elias9988@gmail.com
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