Journal
SOLAR RRL
Volume 6, Issue 9, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.202200559
Keywords
customized molecular additives; device stability; ethanol antisolvent; perovskite solar cells
Funding
- NSFC [U2001217, 21972006]
- Shenzhen Peacock Plan [KQTD2016053015544057]
- Shenzhen-Hong Kong Innovation Circle United Research Project [SGLH20180622092406130]
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This study reports a multifunctional small molecule, BCP-3N, which, when used in combination with ethanol, can reduce defect density, increase open-circuit voltage and conversion efficiency, and improve illumination and humidity stability in perovskite solar cells.
Defects at the perovskite grain boundaries and the interfaces between perovskite and charge transport layers in perovskite solar cells (PSCs) are a curse of nonradiative recombination losses and device degradation channels. Herein, the custom design and synthesis of a multifunctional small molecule (N-2,N-9-bis(3-(dimethylamino)propyl)-4,7-diphenyl-1,10-phenanthroline-2,9-dicarboxamide (BCP-3N) featured by the pi-conjugated phenanthroline and an array of lone-pair electron donor atoms from the carbonyl and amine groups are reported. The BCP-3N is used as a Lewis base to multidentate passivate the undercoordinated Pb2+ ions forming an ultrathin tunnel layer, in synergy with ethanol as a green antisolvent to simultaneously orient the growth of perovskite, resulting in a significantly reduced defect density in perovskite films. With BCP-3N, a significant increase in open-circuit voltage (V-oc = 1.12 V) is achieved of inverted (p-i-n structure) PSCs, along with a record power conversion efficiency of approximate to 21% among alcohol antisolvent processed cells. Also, attested are a much higher illumination and humidity stability of the BCP-3N-based device. Combined experimental and theoretical studies have uncovered the multifunctional roles of BCP-3N in stabilizing high-quality Cs-FA-MA triple-cation mixed perovskites under light, bias, and humidity stresses, enlightening the molecular design for PSCs.
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