In the kitchen, a \u00a0pinch of salt\u00a0 is enough to give life to a dish. In the laboratory, another very different salt promises a similar effect: to add a new flavor to solar energy. What scientists at University College London (UCL) see as a simple chemical additive could become the seasoning that revolutionizes our energy future.<\/p>\n
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A team from UCL has proven<\/a> that adding \u00a0Guanidinium Thiocyanate\u00a0 to Perovskite solar cells significantly increases their \u00a0efficiency\u00a0 and \u00a0stability\u00a0. In trials involving both \u00a0tin\u00a0 and \u00a0lead\u00a0 perovskite layers in tandem solar cells, they achieved an impressive \u00a022.3% efficiency\u00a0, just shy of the record for this class of materials.<\/p>\n <\/p>\n Scientists have highlighted a dual benefit: improved performance and an extended lifespan, achieved by reducing \u00a0microscopic defects\u00a0 during crystal formation.<\/p>\n <\/p>\n The secret lies in how crystals form. Typically, during manufacturing, Perovskite crystals develop in an \u00a0unordered manner\u00a0, presenting microscopic imperfections that impair their performance and longevity. The addition of guanidinium thiocyanate acts as a \u00a0modulator\u00a0, slowing and controlling the crystallization process. It allows the crystals to grow smoother and more uniform, creating layers devoid of holes or defects where electrons can become trapped.<\/p>\n <\/p>\n A complementary study in \u00a0ACS Energy Letters\u00a0 delved deeper<\/a> into this mechanism. According to the authors, guanidinium cations not only enhance the quality of the crystals but also facilitate \u00a0electric charge extraction\u00a0, reduce ion migration, and boost overall stability. This is particularly significant for inverted structures (PIN), which are considered more durable in the long term than traditional designs. As noted by Yueyao Dong (UCL), the study’s lead author: “By modulating the formation of crystals in a controlled way, we were able to create much higher quality films, a change that translates directly into \u00a0more efficient\u00a0 and \u00a0durable\u00a0 devices.”<\/p>\n <\/p>\n The implications of this discovery extend far beyond the laboratory. Each layer of Perovskite in a tandem solar cell can be designed to absorb \u00a0different parts\u00a0 of the solar spectrum. This capability allows for increased energy conversion as more light can be transformed into electricity. According to UCL, utilizing this type of \u201csalt\u201d in the lower tandem layer may propel \u00a0efficiency records\u00a0 even further, as other Perovskite tandems have been recorded with \u00a0over 40% efficiency\u00a0 in lab settings.<\/p>\n <\/p>\n Can You Climb?<\/strong> Perovskites offer another major advantage: they can be produced through low-temperature processes, which are simpler and less energy-intensive compared to \u00a0silicon\u00a0. This opens the door to \u00a0light\u00a0 and \u00a0flexible modules\u00a0 that can be integrated into building facades, windows, or even curved surfaces.<\/p>\n <\/p>\n Another exciting aspect of this finding is that the additive operates during the manufacturing process, eliminating the need for complete device redesigns. In theory, this means easier transitions from lab-grade cells to \u00a0industrial modules\u00a0.<\/p>\n <\/p>\n Nonetheless, significant challenges remain. The most pressing is achieving \u00a0long-term durability\u00a0 certification. Perovskites must prove their resilience against years of exposure to sunlight, humidity, and heat without degrading. Furthermore, the presence of \u00a0lead\u00a0 in many formulations raises concerns around safety.<\/p>\n <\/p>\n UCL’s research focuses on using a \u00a0tin-lead mixture\u00a0, aiming at stability and reducing defects. While these advances are promising, they are not the end goal. The study in \u00a0ACS Energy Letters\u00a0 adds an intriguing note: while small doses of Guanidinium can enhance performance, excessive amounts may be counterproductive, halting charge transport. Similar to cooking, where too much salt can ruin a recipe, balance is crucial here.<\/p>\n <\/p>\n Just as a pinch of salt enhances the flavor of our meals, a bit of guanidinium thiocyanate can elevate Perovskite to a key ingredient in the energy transition. What was once seen as a \u00a0fragile material\u00a0 now offers real promise as a viable alternative to silicon. If scientists successfully stabilize and scale this discovery, we might be on the brink of a new solar era\u2014cleaner, more powerful, and more accessible.<\/p>\n <\/p>\n Image credits | Unsplash<\/a> and Unsplash<\/a><\/p>\n Xataka | All solar panel technologies that exist and which are more efficient, spanning from 1975 to today.<\/p>\nJust a Pinch of Salt<\/h2>\n
The Next Solar Border<\/h2>\n
A Door That Still Has to Cross<\/h2>\n
A Simple Touch Makes the Difference<\/h2>\n