2134/11561352.v1 Liam Welch Liam Welch Sona Ulicna Sona Ulicna Mustafa Togay Mustafa Togay Vincent Tsai Vincent Tsai Andrei Malkov Andrei Malkov Tom Betts Tom Betts Michael Walls Michael Walls Jake Bowers Jake Bowers Extrinsic doping of amine-thiol solution-processed Cu(In,Ga)(S,Se)2 thin film photovoltaics Loughborough University 2020 CIGS thermal evaporation of NaCl sodium doping solution processing 2020-01-10 09:55:42 Conference contribution https://repository.lboro.ac.uk/articles/conference_contribution/Extrinsic_doping_of_amine-thiol_solution-processed_Cu_In_Ga_S_Se_2_thin_film_photovoltaics/11561352 Na post-deposition treatments are commonly used to tackle the fine grained layers that are prevalent in solutiongrown CIGS absorber layers. This work studies the effect of an evaporated NaCl layer on the electrical and morphological properties of amine-thiol solution-processed CIGS solar cells. Here, the NaCl layer acts as a post-deposition Na source and its application resulted in a CIGS device with superior JV characteristics, including a power conversion efficiency increase from 1.3% for a Na free glass substrate to 8.4 % with NaCl post deposition treatment.