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Why modified carbon nanotubes can help the reproducibility problem
Science News from research organizations Why modified carbon nanotubes can help the reproducibility problem. Date: October 18, 2019 Source: Tokyo Institute of Technology Summary: Scientists have conducted an in-depth study on how carbon nanotubes with oxygen-containing groups can be used to greatly enhance the performance of perovskite solar cells. The newly discovered self-recrystallization ability of perovskite could lead to improvement of low-cost and efficient perovskite solar cells. Share: FULL STORY Our search for sustainable energy generation technology has led researchers to investigate various materials and their combinations in many types of devices. One such synthetic material is called "perovskite," which is low-cost and easy to produce, and can be used in solar cells. Perovskite solar cells have attracted much attention because their power conversion efficiency (that is, their efficiency at turning sunlight into electricity) has seen dramatic improvements in recent years. However, it has proven difficult to implement them for large-scale energy generation because of a handful of issues. advertisement One problem that perovskite solar cells face is reproducibility. This means that it is hard to consistently create perovskite crystal layers free of defects and holes, which means that deviations from design values are always likely to occur, which reduce their efficiency. On the bright side, researchers have found that the efficiency of these cells can be boosted by combining perovskite with carbon nanotubes (CNTs). The mechanism by which CNTs and perovskite bond together and how this affects the performance of CNT perovskite solar cells has not been studied in depth. In particular, the ability of pure CNTs to bond to perovskite is not very good, and this could compromise the structural and conducting properties at the interface of both materials. Hence, a team from Tokyo Tech lead by Prof. Keiko Waki conducted a series of experiments on perovskite solar cells combined with different types of CNTs in an attempt to both improve their performance and stability and understand the underlying mechanisms. They used not just pure CNTs, but also CNTs that bore "oxygen-containing functional groups" in their structure, which have been known to strengthen the interaction between the CNTs and perovskite, resulting in better interfaces and enhancing the crystallization of perovskite. This research consisted of several experiments that provided insight into many aspects of CNT-perovskite interactions. First, they demonstrated the superior electrical performance of cells with functionalized CNTs over those with pure CNTs and found evidence supporting that larger crystals and fewer surface defects occur when using functionalized CNTs. Then, the team inferred that the perovskite in the cells would undergo a recrystallization process if stored in the dark, and that the presence of the functional groups in CNT would have a significant effect on this process. This was confirmed by storing the cells for over two months and measuring their electrical characteristics afterwards (Fig. 1). "We have discovered the self-recrystallization ability of perovskite at room temperature, whose morphology greatly improved after long-term storage. However, the most interesting result was the ability of functionalized CNTs to make use of the self-recrystallization nature to form a stronger junction between the perovskite and CNTs through the reconstruction" explains Prof. Waki. Most notably, the functionalized CNTs improved the contact between the two materials greatly and the functional groups served as a protection against attacks from moisture on the perovskite, allowing the self-recrystallization and interface reconstruction to proceed without noticeable degradation. The research team also found that the recrystallization process could be immensely sped up by constantly subjecting the solar cells to frequent measurements, but this ultimately affected their stability and degraded them. Such in-depth studies on perovskite solar cells and ways to enhance them are very valuable because they get us closer to new sources of clean energy. "We hope this study contributes toward the production of perovskites with higher stability and reproducibility," concludes Prof. Waki. These findings will serve as another stepping stone so that we may one see perovskite solar cells as a key technology to preserve our planet. make a difference: sponsored opportunity Story Source: Materials provided by Tokyo Institute of Technology. Note: Content may be edited for style and length. Journal Reference: Jie Chen, Ti Chen, Tangliang Xu, Jia-Yaw Chang, Keiko Waki. MAPbI 3 Self‐Recrystallization Induced Performance Improvement for Oxygen‐Containing Functional Groups Decorated Carbon Nanotube‐Based Perovskite Solar Cells. Solar RRL, 2019; 1900302 DOI: 10.1002/solr.201900302 . Cite This Page: MLA. APA. Chicago. Tokyo Institute of Technology. "Why modified carbon nanotubes can help the reproducibility problem." ScienceDaily. ScienceDaily, 18 October 2019. . Tokyo Institute of Technology. (2019, October 18). Why modified carbon nanotubes can help the reproducibility problem. ScienceDaily. Retrieved October 18, 2019 from www.sciencedaily.com/releases/2019/10/191018131151.htm Tokyo Institute of Technology. "Why modified carbon nanotubes can help the reproducibility problem." ScienceDaily. www.sciencedaily.com/releases/2019/10/191018131151.htm (accessed October 18, 2019). RELATED TOPICS Matter & Energy Solar Energy . Graphene . Electricity . Materials Science . Earth & Climate Energy and the Environment . Renewable Energy . Geomagnetic Storms . Environmental Science . advertisement RELATED TERMS Solar cell . Carbon nanotube . Carbon dioxide . Solar panel . Solar power . Climate engineering . History of Earth . Hadley cell . RELATED STORIES New Lead-Free Perovskite Material for Solar Cells. Feb. 13, 2018 ? Perovskite solar cells are a promising new low-cost photovoltaic technology, but most contain toxic lead. Researchers have introduced solar cells with a new titanium-perovskite material that gets the ... read more Serendipitous Observation May Lead to More Efficient Solar Cells and New Gas Sensors. July 27, 2016 ? While investigating perovskite crystals, scientists made an observation that could make perovskite solar cells more efficient. It could also lead to new sensors for oxygen and water ... read more Stable Perovskite Solar Cells Developed Through Structural Simplification. June 8, 2015 ? Perovskite solar cells are promising low-cost and highly-efficient next-generation solar cells. Now a research team has successfully developed perovskite solar cells with good reproducibility and ... read more Getting Rid of Pinholes in Solar Cells. June 2, 2015 ? Researchers have learned how to eliminate pesky pinholes in perovskite solar cells. 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