The second summer school of the RTG 2767 took place at Wasserschloss Klaffenbach from June 26 to 29, 2023. Here, the team of PhD students elected the new PhD representatives and attended a lecture series on particulate processing concepts for optoelectronics, photovoltaics and sensing devices. The program was complemented by a guest lecture by Prof. Wolfgang Parak (University Hamburg) and a fireside evening with a guest from industry.