Update index.markdown

index.markdown

@@ -36,7 +36,7 @@ We are an academic group at [Imperial College London](https://www.imperial.ac.uk
 
 # Community Projects
 * Open computational materials science [Nature Materials](https://www.nature.com/articles/s41563-023-01699-7)
-* “Roadmap on established and emerging photovoltaics for sustainable energy conversion [J Phys Energy Materials](https://iopscience.iop.org/article/10.1088/2515-7655/ad7404)
+* Roadmap on established and emerging photovoltaics for sustainable energy conversion [J Phys Energy](https://iopscience.iop.org/article/10.1088/2515-7655/ad7404)
 * Best practices in machine learning for chemistry [Nature Chemistry](https://www.nature.com/articles/s41557-021-00716-z)
 * Emerging inorganic solar cell efficiency tables [J Phys Energy](https://iopscience.iop.org/article/10.1088/2515-7655/abebca/meta)
 * Stability assessment and reporting for perovskite photovoltaics [Nature Energy](https://www.nature.com/articles/s41560-019-0529-5)