An Yidan, Wang Changlei, Cao Guoyang, Li Xiaofeng
School of Optoelectronic Science and Engineering and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China.
Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province and Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou 215006, China.
ACS Nano. 2020 Apr 28;14(4):5017-5026. doi: 10.1021/acsnano.0c01392. Epub 2020 Apr 13.
Organic-inorganic heterojunction perovskite solar cell (PSC) is promising for low-cost and high-performance photovoltaics. To further promote the performance of PSCs, understanding and controlling the underneath photoconversion mechanisms are highly necessary. Here, we present a comprehensive opto-electro-thermal (OET) study on the heterojunction PSCs by quantitatively addressing the coupled optical, carrier transport, and thermodynamic behaviors within the device. With achieving a good agreement with the experiment, we theoretically explore the thermodynamic mechanisms involving the energy conversions and focus especially on the origins of the various energy losses in PSCs. We summarize six categories of microscopic heat conversion processes in the heterojunction PSC, where the Joule and Peltier heats can be defined as the intrinsic losses in PSCs. Moreover, we also discuss the possible manipulation methods to decrease the energy losses, for example, by tailoring the doping concentration and energy-level alignment. An exemplified OET optimization is also presented, which predicts that the PCE of the fabricated PSC can be enhanced from 21.37% to 23.84%.
有机-无机异质结钙钛矿太阳能电池（PSC）在低成本、高性能光伏领域具有广阔前景。为进一步提升PSC的性能，深入理解并控制其底层的光电转换机制至关重要。在此，我们通过定量研究器件内部的光、载流子传输和热力学行为，对异质结PSC展开了全面的光热电（OET）研究。在与实验取得良好吻合的情况下，我们从理论上探究了涉及能量转换的热力学机制，并特别关注PSC中各种能量损失的根源。我们总结了异质结PSC中的六类微观热转换过程，其中焦耳热和珀尔帖热可被定义为PSC的固有损失。此外，我们还讨论了降低能量损失的可能调控方法，例如通过调整掺杂浓度和能级对准。文中还给出了一个OET优化示例，预测所制备的PSC的光电转换效率（PCE）可从21.37%提高至23.84%。
