TY - JOUR
T1 - Directing intermediate phase crystallographic orientation promotes carbon-based CsPbI3 perovskite solar cells to beyond 20% efficiency
AU - Li, Gaofeng
AU - Tan, Jieke
AU - Lin, Changqing
AU - Zhu, Cheng
AU - Du, Yujiang
AU - Li, Zhou
AU - Chen, Shulin
AU - Wei, Xiaozhen
AU - Xing, Zhe
AU - Wang, Yuzhe
AU - Lv, Chunyu
AU - Zhang, Qixian
AU - Liu, Huicong
AU - Li, Weiping
AU - Bai, Yang
AU - Yang, Shihe
AU - Lin, Zedong
AU - Liu, Zhike
AU - Chen, Haining
N1 - Publisher Copyright:
© The Author(s) 2026.
PY - 2026/12
Y1 - 2026/12
N2 - Inorganic CsPbI3 perovskite, known for its high chemical stability and near-ideal bandgap, offers a promising solution to the instability of organic-inorganic hybrid perovskites that limit perovskite solar cells (PSCs) longevity. However, the conventional intermediate phase (dimethylammonium lead iodide, DMAPbI3) templating method suffers from inefficient phase conversion, hindering high-performance PSC development. To overcome this limitation, we engineered the crystallographic orientation of DMAPbI3 to promote rapid volatilization of DMAI and accelerating the transformation. Through in situ anchoring of Pb2+-complexing groups (-F < -Cl < -SO4) on TiO2 substrates during chemical bath deposition, we direct the preferential in-plane growth of Pb-rich (100) planes of DMAPbI3, enhancing its [100] orientation. Crucially, stronger complexing groups yield higher orientation degrees, accelerating thermal conversion into highly oriented CsPbI3 perovskite with higher purity and better optoelectronic properties. This strategy enables carbon-based, hole-transport-layer-free CsPbI3 PSCs to achieve a record 20.72% efficiency (certified as 20.35%). Unencapsulated device retains > 85% of their initial efficiency after 1156 h of continuous maximum power point tracking under 1-sun illumination.
AB - Inorganic CsPbI3 perovskite, known for its high chemical stability and near-ideal bandgap, offers a promising solution to the instability of organic-inorganic hybrid perovskites that limit perovskite solar cells (PSCs) longevity. However, the conventional intermediate phase (dimethylammonium lead iodide, DMAPbI3) templating method suffers from inefficient phase conversion, hindering high-performance PSC development. To overcome this limitation, we engineered the crystallographic orientation of DMAPbI3 to promote rapid volatilization of DMAI and accelerating the transformation. Through in situ anchoring of Pb2+-complexing groups (-F < -Cl < -SO4) on TiO2 substrates during chemical bath deposition, we direct the preferential in-plane growth of Pb-rich (100) planes of DMAPbI3, enhancing its [100] orientation. Crucially, stronger complexing groups yield higher orientation degrees, accelerating thermal conversion into highly oriented CsPbI3 perovskite with higher purity and better optoelectronic properties. This strategy enables carbon-based, hole-transport-layer-free CsPbI3 PSCs to achieve a record 20.72% efficiency (certified as 20.35%). Unencapsulated device retains > 85% of their initial efficiency after 1156 h of continuous maximum power point tracking under 1-sun illumination.
UR - https://www.scopus.com/pages/publications/105045281176
U2 - 10.1038/s41467-026-73709-6
DO - 10.1038/s41467-026-73709-6
M3 - Article
C2 - 42185294
AN - SCOPUS:105045281176
SN - 2041-1723
VL - 17
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 6840
ER -