Addition of adamantylammonium iodide to hole transport layers enables highly efficient and electroluminescent perovskite solar cells

Non-radiative recombination losses are reduced drastically by addition of adamantylammonium iodide (ADAHI) into the hole transporting layer (HTL) in a perovskite solar cell, resulting in high efficiency (∼22%), increased V_oc up to 1245 mV, and enhanced electro-luminescence EQE to 2.5%.