Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
DOI: https://doi.org/10.29363/nanoge.ap-hopv.2018.063
Publication date: 27th October 2017
While rapid progress has been made in lead halide perovskite solar cells (PSCs) since the seminal papers from Snaith & Miyasaka and Park in 2012,1,2 much of the underlying device physics that makes these devices so efficient is not well understood. In order for PSCs to achieve their maximum efficiency it is necessary to clearly understand the key loss processes that govern their performance. In particular, understanding the origin of the open-circuit voltage (VOC) is vital. In PSCs, the VOC can shift considerably depending on the choice of transport layer and device architecture, be it from improved perovskite film quality or a better interface between the perovskite absorber and transport layer. To probe the recombination dynamics, transient optoelectronic techniques, such as transient photovoltage, transient photocurrent and charge extraction, offer key insights into the non-geminate charge carrier dynamics in solar cells and can explain the difference in VOC between different devices.3 These techniques have been employed with great success in organic and dye-sensitized solar cells but their application in PSCs is not as straightforward due to lead halide perovskites being mixed ionic-electronic conductors. In this talk I will discuss some of the challenges in using these techniques for PSCs and how they can be overcome to understand the origin of the open-circuit voltage as well as derive addional information into the working mechanisms of PSCs. In particular I will discuss the impact of hole-transporting layers on the VOC in inverted PSCs.
References
1. Lee, Science, 338, 643
2. Kim, Sci. Rep. 2, 591
3. Ryan, Adv. Energy Mater., 7, 1601509
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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