Efficiency enhancement of p-n heterojunction GaAs solar cells via wet chemical etching and pattern design of metal contact - Tingzon, Philippe; Simon, Rhenish; Ragasa, Joseph Christopher; Vasquez, John Daniel; Omambac, Karim; Somintac, Armando; Salvador, Arnel (Proceedings of the 32nd Samahang Pisika ng Pilipinas Physics Congress, 2014)