Industrial Science and Technology (AIST), Tsukuba, Japan. Unveiled effects of the methylammonium chloride additive on formamidinium lead halide: expediting carrier injection from the photoabsorber to carrier transport layers through spontaneously modulated heterointerfaces in perovskite solar cells Time-resolved spectroscopies unveil the additional effects of the widely used methylammonium chloride additive on FAPbI 3 photoabsorber in perovskite solar cells, spontaneously modulating heterointerfaces for accelerating carrier injections. See Naoyuki Nishimura, Hiroyuki Matsuzaki et al ., J . Mater . Chem . C , 2024, 12 , 9130. Materials for optical, magnetic and electronic devices Journal of Materials Chemistry C rsc.li/materials-c PAPER Abderrazzak Douhal et al . Unravelling the photobehavior of a 2,1,3-benzothiadiazole-based HOF and its molecular units: experimental and theoretical insights into their spectroscopic properties in solution and in the solid state ISSN 2050-7526 Volume 12 Number 25 7 July 2024 Pages 8989–9414 rsc.li/materials-c Registered charity number: 207890