[1] [1] LEE M M, TEUSCHER J, MIYASAKA T, et al. Efficient hybrid solar cells based on meso-superstructured organometal halide perovskites［J］. Science, 2012, 338(6107): 643-647.

[2] [2] LIU M, JOHNSTON M B, SNAITH H J. Efficient planar heterojunction perovskite solar cells by vapour deposition［J］. Nature, 2013, 501(7467): 395-398.

[3] [3] LI X, BI D Q, YI C Y, et al. A vacuum flash-assisted solution process for high-efficiency large-area perovskite solar cells［J］. Science, 2016, 353(6294): 58-62.

[4] [4] XING G C, MATHEWS N, SUN S Y, et al. Long-range balanced electron- and hole-transport lengths in organic-inorganic CH3NH3PbI3［J］. Science, 2013, 342(6156): 344-347.

[5] [5] STRANKS S D, BURLAKOV V M, LEIJTENS T, et al. Recombination kinetics in organic-inorganic perovskites: excitons, free charge, and subgap states［J］. Physical Review Applied, 2014, 2(3): 034007.

[6] [6] LIN J, LAI M, DOU L, et al. Thermochromic halide perovskite solar cells［J］. Nature Materials, 2018, 17(3): 261-267.

[7] [7] HALDER A, CHOUDHURY D, GHOSH S, et al. Exploring thermochromic behavior of hydrated hybrid perovskites in solar cells［J］. The Journal of Physical Chemistry Letters, 2015, 6(16): 3180-3184.

[8] [8] LIU S, DU Y W, TSO C Y, et al. Organic hybrid perovskite (MAPbI3-xClx) for thermochromic smart window with strong optical regulation ability, low transition temperature, and narrow hysteresis width［J］. Advanced Functional Materials, 2021, 31(26): 2010426.

[9] [9] ZHANG Y, WANG Z Y, HU S, et al. Robust and swiftly reversible thermochromic behavior of a 2D perovskite of (C6H4(CH2NH3)2)(CH3NH3)［Pb2I7］ for smart window and photovoltaic smart window applications［J］. ACS Applied Materials & Interfaces, 2021, 13(10): 12042-12048.

[10] [10] WHEELER L M, MOORE D T, IHLY R, et al. Switchable photovoltaic windows enabled by reversible photothermal complex dissociation from methylammonium lead iodide［J］. Nature Communications, 2017, 8: 1722.

[11] [11] BILLING D G, LEMMERER A. Synthesis, characterization and phase transitions in the inorganic-organic layered perovskite-type hybrids ［(CnH2n+1NH3)2PbI4］, n=4, 5 and 6［J］. Acta Crystallographica Section B, 2007, 63(5): 735-747.

[12] [12] LEMMERER A, BILLING D G. Synthesis, characterization and phase transitions of the inorganic-organic layered perovskite-type hybrids ［(CnH2n+1NH3)2PbI4］, n=7, 8, 9 and 10［J］. Dalton Transactions, 2012, 41(4): 1146-1157.

[13] [13] BILLING D G, LEMMERER A. Synthesis, characterization and phase transitions of the inorganic-organic layered perovskite-type hybrids ［(CnH2n+1NH3)2PbI4］(n=12, 14, 16 and 18)［J］. New Journal of Chemistry, 2008, 32(10): 1736.

[14] [14] GHOSH D, ACHARYA D, ZHOU L, et al. Lattice expansion in hybrid perovskites: effect on optoelectronic properties and charge carrier dynamics［J］. The Journal of Physical Chemistry Letters, 2019, 10(17): 5000-5007.

[15] [15] FU H M, JIANG C L, LUO C H, et al. A quasi-two-dimensional copper based organic-inorganic hybrid perovskite with reversible thermochromism and ferromagnetism［J］. European Journal of Inorganic Chemistry, 2021, 2021(47): 4984-4989.

[16] [16] DUTTA S, VISHNU S K D, SOM S, et al. Segmented highly reversible thermochromic layered perovskite ［(CH2)2(NH3)2］CuCl4 crystal coupled with an inverse magnetocaloric effect［J］. ACS Applied Electronic Materials, 2022, 4(1): 521-530.

[17] [17] LI W Z, RAHMAN N U, XIAN Y M, et al. Regulation of the order-disorder phase transition in a Cs2NaFeCl6 double perovskite towards reversible thermochromic application［J］. Journal of Semiconductors, 2021, 42(7): 072202.

[18] [18] ZHANG W C, SUN Z H, ZHANG J, et al. Thermochromism to tune the optical bandgap of a lead-free perovskite-type hybrid semiconductor for efficiently enhancing photocurrent generation［J］. Journal of Materials Chemistry C, 2017, 5(38): 9967-9971.

[19] [19] MAιCZKA M, PTAK M, GAιGOR A, et al. Layered lead iodide of ［methylhydrazinium］2PbI4 with a reduced band gap: thermochromic luminescence and switchable dielectric properties triggered by structural phase transitions［J］. Chemistry of Materials, 2019, 31(20): 8563-8575.

[20] [20] NING W H, ZHAO X G, KLARBRING J, et al. Thermochromic lead-free halide double perovskites［J］. Advanced Functional Materials, 2019, 29(10): 1807375.

[21] [21] AKKERMAN Q A, MANNA L. What defines a halide perovskite?［J］. ACS Energy Letters, 2020, 5(2): 604-610.

[22] [22] WANG X J, LI T S, XING B Y, et al. Metal halide semiconductors beyond lead-based perovskites for promising optoelectronic applications［J］. The Journal of Physical Chemistry Letters, 2021, 12(43): 10532-10550.

[23] [23] MITZI D B. Synthesis, structure, and properties of organic-inorganic perovskites and related materials［J］.Progress in Inorganic Chemistry, 1999, 48: 1-121.

[24] [24] SAPAROV B, MITZI D B. Organic-inorganic perovskites: structural versatility for functional materials design［J］. Chemical Reviews, 2016, 116(7): 4558-4596.

[25] [25] MACZKA M, PTAK M, GAGOR A, et al. Methylhydrazinium lead bromide: noncentrosymmetric three-dimensional perovskite with exceptionally large framework distortion and green photoluminescence［J］. Chemistry of Materials, 2020, 32(4): 1667-1673.

[26] [26] NEUTZNER S, THOUIN F, CORTECCHIA D, et al. Erratum: exciton-polaron spectral structures in two-dimensional hybrid lead-halide perovskites［J］. Physical Review Materials, 2020, 4(5): 059901.

[27] [27] THOUIN F, NEUTZNER S, CORTECCHIA D, et al. Stable biexcitons in two-dimensional metal-halide perovskites with strong dynamic lattice disorder［J］. Physical Review Materials, 2018, 2(3): 034001.

[28] [28] YANGUI A, SY M, LI L, et al. Rapid and robust spatiotemporal dynamics of the first-order phase transition in crystals of the organic-inorganic perovskite (C12H25NH3)2PbI4［J］. Scientific Reports, 2015, 5: 16634.

[29] [29] YU S K, ZHANG Z R, REN Z H, et al. 2D lead iodide perovskite with mercaptan-containing amine and its exceptional water stability［J］. Inorganic Chemistry, 2021, 60(12): 9132-9140.

[30] [30] XIE G Y, WANG L, JU D X, et al. Thermochromism perovskite (COOH(CH2)3NH3)2PbI4 crystals: single-crystal to single-crystal phase transition and excitation-wavelength-dependent emission［J］. The Journal of Physical Chemistry Letters, 2022, 13(1): 214-221.

[31] [31] ZENG Y L, HUANG X Q, HUANG C R, et al. Unprecedented 2D homochiral hybrid lead-iodide perovskite thermochromic ferroelectrics with ferroelastic switching［J］. Angewandte Chemie, 2021, 133(19): 10825-10830.

[32] [32] ZHAO Z R, GU F D, LI Y L, et al. Mixed-organic-cation tin iodide for lead-free perovskite solar cells with an efficiency of 8.12%［J］. Advanced Science, 2017, 4(11): 1700204.

[33] [33] MENG W W, WANG X M, XIAO Z W, et al. Parity-forbidden transitions and their impact on the optical absorption properties of lead-free metal halide perovskites and double perovskites［J］. The Journal of Physical Chemistry Letters, 2017, 8(13): 2999-3007.

[34] [34] QIAN L, SUN Y L, WU M M, et al. A lead-free two-dimensional perovskite for a high-performance flexible photoconductor and a light-stimulated synaptic device［J］. Nanoscale, 2018, 10(15): 6837-6843.

[35] [35] ZIMMERMANN I, AGHAZADA S, NAZEERUDDIN M K. Lead and HTM free stable two-dimensional tin perovskites with suitable band gap for solar cell applications［J］. Angewandte Chemie International Edition, 2019, 58(4): 1072-1076.

[36] [36] AREND H, HUBER W, MISCHGOFSKY F H, et al. Layer perovskites of the (CnH2n+1NH3)2MX4 and NH3(CH2)mNH3MX4 families with M=Cd, Cu, Fe, Mn or Pd and X=Cl or Br: importance, solubilities and simple growth techniques［J］. Journal of Crystal Growth, 1978, 43(2): 213-223.

[37] [37] CARETTA A, MIRANTI R, ARKENBOUT A H, et al. Thermochromic effects in a Jahn-Teller active CuCl4-6 layered hybrid system［J］. Journal of Physics Condensed Matter, 2013, 25(50): 505901.

[38] [38] LI J W, LIU X L, CUI P X, et al. Lead-free thermochromic perovskites with tunable transition temperatures for smart window applications［J］. Science China Chemistry, 2019, 62(9): 1257-1262.

[39] [39] ELATTAR A, SUZUKI H, MISHIMA R, et al. Single crystal of two-dimensional mixed-halide copper-based perovskites with reversible thermochromism［J］. Journal of Materials Chemistry C, 2021, 9(9): 3264-3270.

[40] [40] PAREJA-RIVERA C, SOLIS-IBARRA D. Reversible and irreversible thermochromism in copper-based halide perovskites［J］. Advanced Optical Materials, 2021, 9(15): 2100633.

[41] [41] LIU J C, LIAO W Q, LI P F, et al. A molecular thermochromic ferroelectric［J］. Angewandte Chemie, 2020, 132(9): 3523-3527.

[42] [42] HUANG C R, LUO X Z, CHEN X G, et al. A multiaxial lead-free two-dimensional organic-inorganic perovskite ferroelectric［J］. National Science Review, 2020, 8(5): nwaa232.

[43] [43] SUN B, LIU X F, LI X Y, et al. Reversible thermochromism and strong ferromagnetism in two-dimensional hybrid perovskites［J］. Angewandte Chemie International Edition, 2020, 59(1): 203-208.

[44] [44] GUO W Q, LIU X T, HAN S G, et al. Room-temperature ferroelectric material composed of a two-dimensional metal halide double perovskite for X-ray detection［J］. Angewandte Chemie International Edition, 2020, 59(33): 13879-13884.

[45] [45] WANG C F, LI H J, LI M G, et al. Centimeter-sized single crystals of two-dimensional hybrid iodide double perovskite (4, 4-difluoropiperidinium)4AgBiI8 for high-temperature ferroelectricity and efficient X-ray detection［J］. Advanced Functional Materials, 2021, 31(13): 2009457.

[46] [46] WANG M J, CHEN X R, TONG Y B, et al. Phase transition, dielectrics, single-ion conductance, and thermochromic luminescence of a inorganic-organic hybrid of triethylpropylammonium PbI3［J］. Inorganic Chemistry, 2017, 56(16): 9525-9534.

[47] [47] JIA Q Q, LUO Q F, NI H F, et al. High-sensitivity organic-inorganic hybrid materials with reversible thermochromic property and dielectric switching［J］. The Journal of Physical Chemistry C, 2022, 126(3): 1552-1557.

[48] [48] LIU G F, LIU J, SUN Z H, et al. Thermally induced reversible double phase transitions in an organic-inorganic hybrid iodoplumbate C4H12NPbI3 with symmetry breaking［J］. Inorganic Chemistry, 2016, 55(16): 8025-8030.

[49] [49] ZHAO X C, FU Y K, LEI Y L, et al. Crystal structure and thermochromic behavior of the quasi-0D lead-free organic-inorganic hybrid compounds (C7H9NF)8M4I16 (M=Bi, Sb)［J］. Journal of Alloys and Compounds, 2022, 899: 163278.

[50] [50] SHARMA M, YANGUI A, LUSSON A, et al. Additive-assisted synthesis and optoelectronic properties of (CH3NH3)4Bi6I22［J］. Inorganic Chemistry Frontiers, 2020, 7(7): 1564-1572.

[51] [51] SINGH A, SATAPATHI S. Reversible thermochromism in all-inorganic lead-free Cs3Sb2I9 perovskite single crystals［J］. Advanced Optical Materials, 2021, 9(22): 2101062.