TY - JOUR
T1 - Control of Crystal Structures and Optical Properties with Hybrid Formamidinium and 2-Hydroxyethylammonium Cations for Mesoscopic Carbon-Electrode Tin-Based Perovskite Solar Cells
AU - Tsai, Cheng Min
AU - Lin, Yu Pei
AU - Pola, Murali Krishna
AU - Narra, Sudhakar
AU - Jokar, Efat
AU - Yang, Yaw Wen
AU - Diau, Wei-Guang
N1 - Publisher Copyright:
© 2018 American Chemical Society.
PY - 2018/9/14
Y1 - 2018/9/14
N2 - Alcohol-based bifunctional ammonium cations, 2-hydroxyethylammonium (HEA+), HO(CH2)2NH3 +, were introduced into formamidinium (FA+) tin-based perovskites (HEAxFA1-xSnI3; 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 (HEAxFA1-xSn0.67I2.33, 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 JSC = 18.52 mA cm-2, VOC = 371 mV, FF = 0.562, and overall efficiency η = 3.9% after the device was stored for a period of 340 h.
AB - Alcohol-based bifunctional ammonium cations, 2-hydroxyethylammonium (HEA+), HO(CH2)2NH3 +, were introduced into formamidinium (FA+) tin-based perovskites (HEAxFA1-xSnI3; 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 (HEAxFA1-xSn0.67I2.33, 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 JSC = 18.52 mA cm-2, VOC = 371 mV, FF = 0.562, and overall efficiency η = 3.9% after the device was stored for a period of 340 h.
UR - http://www.scopus.com/inward/record.url?scp=85052371503&partnerID=8YFLogxK
U2 - 10.1021/acsenergylett.8b01046
DO - 10.1021/acsenergylett.8b01046
M3 - Article
AN - SCOPUS:85052371503
SN - 2380-8195
VL - 3
SP - 2077
EP - 2085
JO - ACS Energy Letters
JF - ACS Energy Letters
IS - 9
ER -
