Control of Crystal Structures and Optical Properties with Hybrid Formamidinium and 2‑Hydroxyethylammonium Cations for Mesoscopic Carbon-Electrode Tin-Based Perovskite Solar Cells

• Published in: ACS energy letters Vol. 3; no. 9; pp. 2077 - 2085
• Main Authors: Tsai, Cheng-Min, Lin, Yu-Pei, Pola, Murali Krishna, Narra, Sudhakar, Jokar, Efat, Yang, Yaw-Wen, Diau, Eric Wei-Guang
• Format: Journal Article
• Language: English
• Published: American Chemical Society 14.09.2018
• ISSN: 2380-8195; 2380-8195
• DOI: 10.1021/acsenergylett.8b01046

Alcohol-based bifunctional ammonium cations, 2-hydroxyethylammonium (HEA+), HO­(CH2)2NH3 +, were introduced into formamidinium (FA+) tin-based perovskites (HEA x FA1–x SnI3; x = 0–1) to absorb light in carbon-based mesoscopic solar cells. We found that HEA+ cations play a key role to control the crystal structures, the lattice structures altered from orthorhombic (x = 0) to rhombohedral (x = 0.2–0.4) with greater symmetry. When x was increased to 0.6–1.0, tin and iodide vacancies were formed to generate 3D-vacant perovskites (HEA x FA1–x Sn0.67I2.33, x ≥ 0.6) with a tetragonal structure. Tin-based perovskites in this series were fabricated into mesoporous solar cells using one-step drop-cast (DC), two-step solvent-extraction (SE), and SE + 3% ethylenediammonium diiodide (EDAI2) as an additive. After optimization of device performance with the SE + 3% EDAI2 approach, the HEA0.4FA0.6SnI3 (HEAI = 40%) device gave the best photovoltaic performance with J SC = 18.52 mA cm–2, V OC = 371 mV, FF = 0.562, and overall efficiency η = 3.9% after the device was stored for a period of 340 h.